Product Reviewed: SAE 5W-30 Signature Series 100% Synthetic Motor Oil (ASL)
Current Rating: 4.97 out of 5 stars
Votes & Reviews: 1010 vote(s) and 1476 user reviews.
Reviewed by
Tony: 
My car seem to run better and I get better gas mileage.
Reviewed by OceanBoy:
I have been using Amsoil for over 20yrs. I use it on my cars,suv's,motorcycles,lawnmowers,boats,&jetski's!!
In the long run it is the "BEST THING" you can do for your machinery!!!
Reviewed by Travis Brockmoore:
I use Amsoil in all of my cars and they see a good amount of abuse from track days and autocross. Amsoil keeps my cars going strong. Proven to last longer and it does. Worth the money up front because you'll spend less in the long run.
Reviewed by Doug:
This best lubricant in the world hands down!
Reviewed by Crazzyjoe:
Used this oil in all my daily driven cars very happy with it . I also use amsoil in my classic cars great oil.
Reviewed by Mysftail:
I was introduced to the signature series by a friend who works on motorcycles for a living. He told me a story of this guy who called him and said he didn't have any oil pressure in his bike. My friend said bring the bike over and he would look at it. The guy showed up three hours later, and when my friend asked him what took so long. The guy said he had to drive it there, from North
Carolina! We live in South Carolina. My friend tore down the bike expecting major damage, but not even a score on the walls of the bore.
I won't use anything else, and because my wife's car has a twin scroll turbo in it, i make it a mandatory when doing maintenance!
Reviewed by JD:
best oil hands down, make sure to check your oil often. When running this if your low you wont know it unless you check.
Reviewed by ANITA:
Use in my 99 ford Explorer
Reviewed by Giovanni:
I use 5w30 in my car that has just shy of 200,000 miles I recently switched from 0w20 too 5w30 because of the miles I drive the car everyday pretty hard 75 miles each way too work I use amsoil since day one in every application possible and I have zero signs of wear on anything from the brake components too injectors
Reviewed by None:
Use 15w40 in my Ford excursion 2002 since new 140000 mi oil analysis shows no change since new .This is a 7.3 l diesel.
Reviewed by Matt:
Been running Signature 5w30 in the last 3 brand new vehicles I have purchased. Change them over at 1st oil change. Does well in the hottest summer days and the coldest winter days. Use with the amsoil ea filter when available for my application and run 15k miles for change intervals.
Reviewed by diamonbird:
You can't buy a better insurance policy for your vehicles
Reviewed by Scorpion:
Amazing motor oil! I use it in all my American vehicles. We drove the RV to DisneyWorld in FL. I forgot to pack the oil change. Ordered oil online, Amsoil shipped it and it arrived the next day in FL. Easy oil change!
Reviewed by Toga:
Runs great in my Tacoma and the oil is still running strong with 6,500 miles on the oil. Power and mpg still runs great.
Reviewed by Joe:
I have been using Amsoil for a couple of years now. It started with my 2012 Chevy Traverse. Chevy required that I use a oil that was partially synthetic. I started using this because my dealership didn't work on Saturdays and it was hard to get in for an oil change. Also I soon realized that I couldn't trust the quick change oil shops either. I have a shop that will use my oil and charge me a reasonable fee for changing oil that I can trust. I like that I can go for a year on the oil and it helps keep my cost down. I would like to add my brother uses this oil also. He has a 2004 GMC Yukon XL with over 250,000 miles on it now on the original motor. When he started using it he had around 130,000 miles on the motor and it was using about a quart of oil every 2000 miles. When he started using Amsoil it kept using oil until he had around 6,000 miles on the first oil change and it suddenly quit using oil. We are both convinced that Amsoil saved that motor. Him and I are using Amsoil in all of our engines as well other Amsoil products and are extremely happy with Amsoil and will keep using it
Reviewed by Chad:
Love the ability to drive a full year with out having to do an oil change. I may seem more expensive up front, but in a years span you saving loads of cash and your engine loves the quality.
Reviewed by cj:
my 99 acura is running great after oil change
Reviewed by Pun:
Personal oil changes. And I like the fact that you don't have to do oil changes for a year or 25,000 miles
Reviewed by Luis:
I use it on my chevy vehicles. The product and lab reports on it speak for themselves. This is a must product if your vehicle requires it.
Reviewed by Lennox:
Excellent product
Reviewed by Merwin:
Have this in my 2007 silverado.Seems to be doing as advertised.No engine problems at all.Runs great......Will continue using this oil.No cold starting issues with it.
Reviewed by
David:
I swear by this oil. Simply the best fully synthetic oil out there. I got 220000 miles on my Altima and still has great fuel mileage and power.
Reviewed by Stephan:
I use this oil in all my newer gas engines, runs smooth, no engine noise, better gas mileage.
Reviewed by Rob:
Used in all my vehicles. Season after season the best. An easier to read side window would be nice
Reviewed by Chris:
Been using this oil for at least 10 years!
Great product!
Mileage increased in three of the vehicles by almost 5 mpg!
Reviewed by
Donald:
This is the best motor oil on the planet. I have used it in all my cars with excellent results.
Reviewed by Enrique:
Will never try any other oil in my vehicle only run amsoil
Reviewed by Enrique:
I love this product makes my car run way smoother
Reviewed by David:
I must use product
Reviewed by Greg:
Great oil been using in my toyota tacoma I change the filter at 10k (EA) and complete drain at 20k. Truck doesnt smoke and runs great with 225k miles.
Reviewed by Kassidy:
Amazing oil, the best you can buy, noticed improvements in mpg
Reviewed by Lucas:
I use this in my 2012 Silverdo with the 5.3 V8 and it is great. I run it for a year and forget about it. Keeps the engine clean and cool.
Reviewed by Walter:
Great product I use in my suburban.
Reviewed by Denis:
If you plan to keep your car or truck more than 5 years or over 15 years like me; just invest in the best oil. As a bonus: change the oil just once a year.
Reviewed by Gregory:
I have a 2007 Buick Terraza 3.9L V6. I have used Amsoil Signature Series 5w-30 since I bought it with 19000 miles. It now has 158000 miles on it. First thing I noticed when I switch to Amsoil was a smoother idle. Gas mileage increased 2 miles per gallon. Even with 158000 miles the gas mileage has stayed consistent at 19 in the city and 25 on the highway. I change my oil once a year with 12000 miles on the oil.
Reviewed by Samuel:
This is for a newer turbocharged volvo, oil always looks good when it comes out and the engine is nice and clean inside as well.
Reviewed by Raul:
Have been using this oil since 2005 in my truck. 2005 silverado 5.3L tuned and full bolt ons. I had used it prior for 3 years in an older truck I had. Very confident with Amsoil that I've been changing the oil in the silverado once a year for the past 11 years. I also have a 2014 and Amsoil is used in it as well since the first oil change was due. Back to the 2005 truck. Reason I told you its tuned... many people know how a tune gets your engine a "little" less life. Well, I have had to change out the valve cover gaskets twice within the 11 years I've owned it and as far as valves and heads. They're like brand new. Once a year change intervals. Truck has 140k+ miles. Amsoil has kept it running smooth since day one. Can't beat that!
Reviewed by Robbie:
2008cadillac dts I been useing it for 5 years in the car
Reviewed by Jamie:
I use all Amsoil products in all my SUV and cars
Use the metal products on my firearms to prevent rust and smooth operation
Amsoil is the best by far. And my family's trucks and cars
Reviewed by Matthew:
The best
Reviewed by Paul:
I,ve been using Amsoil for many years and there's no better oil out there. Thanks Paul
Reviewed by Chris:
I live in a cold climate, even at -36 there is no need to plug my vehicles block heater in.
Reviewed by Greg:
Amsoil synthetic is a high quality oil. I use it in all my vehicles. If you want superior oil with extended oil changes, amsoil is the way to go.
Reviewed by Robert:
I use nothing but AMSOIL for my Toyota Tundra with 162,000 miles, mostly all local driving, use a 15,000 mile filter, and my truck doesn' t lose a drop oil. Great stuff.
Reviewed by Mark:
amsoil is all i use. truck, car, scag, polaris, and harley. the best.
Reviewed by Eduardo:
So far it's been nine months since I changed the oil on my daughters cobalt and Sentra , and the oil is holding up extremely well . recently replaced it on my wife's 2013 Altima and my dad's 2007 Dodge ram 1500 . So we'll see what holds up as just as well has on our cars . I use the European formula on my BMW and it's awesome . Actually better than the regular TwinTurbo oil and just a tad better than the M formula
Reviewed by Ken:
Car runs great with this oil
Reviewed by MICHAEL:
Excellent product. Will continue to use and purchase.
Reviewed by Mark:
On a friends recommendation I switched to Amsoil for use in my 2005 Jeep Liberty Diesel. I sold the Liberty after 3 years but have continued to use Amsoil
products in all of my Vehicles, generators, lawn tractors, push mowers, and snow blower. The Signature Series 5W-30 is my oil of choice for my GMC Sierra, and my wife's
Lincoln MKX. I highly recommend trying all of Amsoil's products, everything I have tried I have been completely satisfied with, oils, grease, sprays, fuel additives, filters, ect....
Reviewed by LEE:
I just started using oil and noticed a difference in the operation of the engine within the first change it is smoother running and quiet
Reviewed by Michael:
have been using exclusively for five years it is the best performing synthetic oil you can use
Reviewed by John:
I use only Signature Series 5w-30 in my 2008 Toyota Sienna and she purrs like a kitten. This stuff is guarantees for 25,000 miles even though I have never pushed it that far but believe it will stand up to the miles as instructed. Used Mobil 1 products for years but found Amsoil and have never looked back. Fair price, great shipping and I enjoy knowing that I am using the best. Turned on many of my friends and co-workers to Amsoil and they have all bee amazed by the performance of the oil. One person in particular had a Chevy Suburban with nearly 200,000 miles on it and was contemplating dropping in a new engine due to some form of tapping noise. I introduced the person to Amsoil and was pleased to hear the noise had nearly disappeared and his vehicle is running like a race horse. Thanks you Amsoil for making superior products for those of us who cannot afford to buy new vehicles every couple of years. If you want your stuff to last, Amsoil oil is the way to go. Just give it a try and you will not be disappointed.
Reviewed by Willie:
Everything works as advertised. Best oil ever. I'll use it now and forever
Reviewed by Tim:
Put oil and filter in my son's car, he forgets to check oil like he should but with 4 quarts of Amsoil, is better then 5 quart of regular oil, so I know his car is covered.
Reviewed by Charles:
Been using this product for about 3 years. No troubles ever
Reviewed by LANCE:
I have been using the Amsoil products now for about 4 years, first in my 1999 VFR800 then my
Ranger and now my Nissan Frontier and 2012 Sante Fe. I am very pleased with their performance in my vehicles and in knowing I have the best protection for my engines.
I also like the fact that I am using less oil annually and the extended oil change dates make maintaining my vehicles less time consuming. l would recommend these products to others for the time savings alone, it makes it a lot nicer to only have one oil change a year per motorized product vs. the 2-4 I was doing in the past for each vehicle.
Buy the products, use them as specified and you won't be disappointed.
Reviewed by ROB:
I have tried every oil out there. Some burn off before the next oil change. Some have inconsistent colour between bottles. And one of the TOP NAMES had DIRT in the bottom of the bottle. And this stuff was supposedly made from NATURAL GAS!!!! I called them and they didnt care. This makes me wonder
how well quality control is at some of these companies.
I expect quality for my money. I expect consistency. And with Ams oil I been getting just that.
I run my Cars,Truck and toys very hard and I expect them to last so I use the best.
Great stuff
Reviewed by Joshua:
I have this oil in my boat motor, a 400hp 6.2L inmar Ford Raptor. Nothing bad to say about amsoil....ever. GET SOME.
Reviewed by Stephen:
I use Amsoil 5W30 Signature Series in all 3 of my vehicles. After using the 10W40 in my motorcycle and watching the "White Papers" comparative study on 5W30 motor oils done by a reputable 3rd party test lab I was convinced that this was the best oil on the market. And they don't have other product lines to fall back on if sales don't demonstrate it is a quality product. The "White Papers" comparative study results really says it all. I am an Amsoil customer for life and have also convinced a family member who also happens to drive one of the vehicles in our family that you cannot lose but only win with Amsoil. He is sold on it too!
Reviewed by Simon:
I've used AMSOIL for 25 years religiously, and have done the research. (I also do analysis regularly) AMSOIL Signature Series oils are the best money can buy. Well worth the extra price over Dino oils! Also the best synthetic at any price! If you are not using AMSOIL, you are missing out!
Reviewed by Alan:
I use it because the additive package is so robust, it can handle the severe service manner in which I use my Explorer. Combined with the Amsoil Oil Filter, I can go 15k miles or 1 year, even under severe-service use.
Reviewed by Robert:
Have just switched to Amsoil for my truck, so too early to review. I will say, though, that cold weather (-25c) starts are a breeze. If it performs as well as in my bike, it will be my go to oil.
Reviewed by Robert:
5 star
Reviewed by Elwood:
Great oil, engine runs smooth, make sure you use the Amsoil filters and for new users use the engine flush before introducing Amsoil oil and filter
Reviewed by Robert:
Used this in my 2012 RDX and got 150K miles with NO problems, and changed every 10K. The BEST! Will do the same with 2017.
Reviewed by Bobby:
I run this oil in my 2.7 Ecoboost. Since it is a turbocharged engine, I know it is protected with this oil.
Reviewed by DAVE:
Great stuff...pour it in and don't look back
Reviewed by Robert:
Installed in my 2013 GMC Sierra 1500 at around 36000 miles. My 1st oil change after purchasing the truck used. Long time AMSOIL user and very pleased with how it preforms.
Reviewed by Bobby:
I use signature series for all my vehicles. It saves me time & money. I only have to change my oils once a year with the 25000 mile or 12 months.
Reviewed by Phil:
I have been using the Amsoil Signature series oil for over 15 years in my vehicles. Living in the northern part of Alberta, Canada and travelling even further north numerous times of the year made this one of the best decisions I made. For hours of highway speeds and the sometimes (especially in the winter months) at extreme low temperatures this is the only oil that has given me the confidence and reliability I have ever encountered.
Reviewed by Christopher:
Use it in my 06 Pathfinder and 14 Evo X. Great cold start up and even better protection once hot. Viscosity breakdown is almost non-existent. I have been using AMSOIL for years in engines, transmissions(where applicable), transfer cases,
differentials, and firearms. Actually, my Evo X tuner(renown CBRD in York, PA) told me to use AMSOIL. Great products.
Reviewed by Leo:
The turbocharged engine in my car is very picky on oil, and AMSOIL is one of two brands that I had been using. As the local stores here so not stock Amsoil anymore, I purchased online and it was a great experience - lightning shipping and product as ordered. Thank you so much again,
Leo.
Reviewed by Jeff:
Amsoil is a great company providing a great product.
Reviewed by Craig:
I don't put anything else in my vehicles.
Reviewed by Scott:
Best in class in quality. Best n class in service. Best in class delivery.
(In my book)
Reviewed by Josh:
It's great couldnt ask for a better product for the price
Reviewed by Jake:
I let the quick oil change stations change my oil with my oil instead of theirs.
Reviewed by Mechghy78:
I changed to amsoil from gm dexos as I wanted something better for my Cruze. After 10k of running dexos as it was included with the car, I switched to amsoil and immediately noticed the engine running quieter than with dexos. I am happy with the change so far and am looking forward to see how it holds up as I only have 1500 miles on it so far. We'll see what happens when I get into my second oil change.
Reviewed by Pinball Bob:
2010 Ford Explorer and soon to be 2015 Chevrolet Silverado. I do have other gas powered items, lawn tractor, edger, tiller, etc. I really need to convert them over as I have had nothing but great results with your product.
Reviewed by Gary:
I have been using this oil in my dirt bikes for 40 years now!! I mix it with avation fuel at 83 to 1. they have always ran great!!
Reviewed by J-rod:
I made the switch to Amsoil with 25,000 miles on my truck after doing a lot of research on which oils would be best for my style of driving (I do a
lot of sever off-road driving in my truck through the California deserts). Due to my style of driving I decided to do an oil change at 10,000 miles rather than the 15,000 that Amsoil recommends for "severe driving". After the first oil change I also had an oil analysis completed. To my surprise the results came back great. They also said I could have probably gone another 3,000 - 5,000 miles! That would have been 13-15K miles between changes with a solid 500 miles of that being run in hot dusty desert conditions with the engine pushing high RPM's... not to mention the LA traffic I get to put up with when I decide to stay on the road.
Long story short... Amsoil is more expensive than most other oils, but you can easily go 2-3x longer between changes!
Reviewed by BCB:
I use this oil in my 2015 Volvo S60 T-5. The recommended oil is Castrol Professional with an ACEA of A5/B5. I have not been able to purchase this oil even from the dealership (in fact they recommended an off the shelf Castrol oil). Amsoil Signature Series 5w-30 has an ACEA of A5/B5 and I feel it to be a superior oil. Volvo's engines are considered to be long life (million plus miles) I intend to find out with the help of Amsoil
Reviewed by WD:
I use 5-30 in my 5.7 hemi. The mileage increased 3mpg, hence free oil.
Reviewed by Lemar:
I first started using Amsoil 5W30 on my brand new 1994 Ford Ranger Splash 4.0L on the advice of my uncle who was a dealer at the time. Except for the 4 years I owned a 2004 Saturn Vue 3.5L which used Amsoil Signature Series 5W20, it's all I've used since, and all I'll ever use. It or Amsoil. Here are the vehicles I've used it in, and I advise anyone reading this
to use it too.
1978 Ford E150 351W
1994 Ford Ranger Splash 4.0L
1996 Honda Accord 2.2L
1998 Acura 3.5RL
2004 Chevy Trailblazer 4.2L
2003 Saturn Vue 2.2L
2004 Saturn Vue 3.5L (5W20)
2008 Ford Explorer Sport Trac 4.0L
2010 Nissan Altima 2.5 S
Reviewed by Tom:
Start ups used to sound like a machine shop and now it much quieter.
Reviewed by Lee:
I purchased a used 2012 Chevy Volt I did not know what oil had been used may have been dealer oil and filter when I drained out the old oil it came out quickly and very dirty that would explain why the engine may have been on the noisy side. I used the required oil that is recommended and when the engine started there was hardly any noise from the engine and very little vibration. Great oil has been running great since I used Amsoil oil and filter.
Reviewed by Motomonkey116:
I change my oil 1 a year. I have never had any engine or fuel economy issues. Even when I am low on oil. My vehicle have over 175,000.
Reviewed by fryer:
awesome as all Amsoil products are! this stuff kicks ! I will be buying more next month. oil held up great still looks good feels good! oil pressure never dropped and still hasn't dropped. 140000 +miles on it worked great all winter long. and I only have to change my oil once a year! how sweet is that,
Reviewed by tman:
I've used Amsoil products for many years on both Pickup truck and van. Completely satisfied with the price and performance.
Reviewed by N/A:
I use both Amsoil oil filters and synthetic signature 5W-30 in my 21012 Avalon. Very Happy with both and will continue to use this product. Everyone at Amsoil is always professional and helpful with any questions I have. Great product.
Reviewed by Archer:
Dads 1993 ford ranger 2.3 and 230,000 miles really seems to like it. Best we've ever used
Reviewed by Sammich:
Good product for people who put lots of kms on there vehicles. Bit pricey
Reviewed by Miller:
I my truck, cars all the time since 1999
Reviewed by Al:
My wife calls me a techno-geek. It's actually true. I am an engineer. I research everything I purchase. When I purchased a used pickup in 2006 it had 180K miles. I immediately changed ALL of the fluids to their respective types with Amsoil. My pickup now has 373K . I would not hesitate to drive it to Alaska and back. I trust Amsoil in all my machines.
Reviewed by amsoil man:
I run this in every car I own and have for years. less maintenance since you only have to change it once a year is worth a little extra cost to me started putting it in my 5.4 triton truck when I got it used with like 160k on it. it smokes like heck but still going at over 300,000 miles!! that is really saying something about this oil and it burns less of amsoil than other synthetics.
Reviewed by Maximum RPM:
It didn't take long for my order of oil and filters to arrive. I remember placing the order, next thing I knew it was at my door. You don't get service like that anywhere else
Reviewed by Ash:
I love the product I only wish you offered free shipping more often .
Reviewed by Fishnpole:
Bought a 2013 Tacoma brand new. First thing I did was drain the fluids and replaced everything with amsoil product. Dealer techs thought I was crazy because they offer 2 years free oil changes, I think they are crazy for try to put another oil in my pickup. Love this stuff and only need to change once a year.
Reviewed by Louis:
I have used this oil in my 2008 Toyota Prius since November 2015. There was a noticeable improvement in gas mileage. I consistently get 52 to 54 MPG. My Prius has 183.000 miles and it runs better than new. It does have higher oil consumption than when I used petroleum based oil, but it hasn't impacted the performance. It should help the engine last a long time.
Canada
United States
I buy these products yearly
I do all my cars motorcycles lawnmowers etc. once a year