Product Reviewed: 20W-50 Synthetic Premium Protection Motor Oil (ARO)
Current Rating: 4.94 out of 5 stars
Votes & Reviews: 33 vote(s) and 44 user reviews.
Reviewed by James: 
Purchased for use in an inboard v 6 boat engine. Great oil for this application.
Reviewed by Cecil:
Great product
Reviewed by Richard:
Love this oil, the full synthetic oil I was using can not even hold a candle to AMSOIL. The engine runs so smooth and much more quietly : )
I also went from a 5w30 to the 10w40 for the summer, will change back to the 5w30 for the winter.
When I'm ready for a transmission fluid change I'm changing over to AMSOIL too.
Richard
Reviewed by Joey:
Bought this oil for our 2015 Scag Cheetah, so far it's amazing, it seems to run way better, and for some reason it doesn't pop anymore when starting it. It has a 31 hr Kawasaki motor . Our dealer told us to use 20 w50 in it, now I gotta cross reference the oil filter and order some.
Reviewed by Adam:
Product does wonders in the evo. The turbo requires high zinc so this does the job.
Reviewed by Shawn:
This Amsoil Motor Oil is used in a track car that constantly see's high RPM pulls on a road race course. Works well and oil temps seem to stay steady throughout a 20-30 minute session. Am pleased with the product and will continue to use it. It's what I would call "cheap insurance".
Reviewed by Thor:
The Amsoil high zinc formula is all i use in my bbc. This oil holds up to the heat and high compression of my street/strip motor.
Reviewed by George:
I will continue to purchase nothing but AMSOIL for all our lubrication needs. Classic cars, snowmobiles, 4 wheelers, and our daily drivers. Gas and diesel. And dont forget the boats. It's one place for everything, shipped to my door.
Reviewed by Hilton:
Dad wanted an upgraded oil in his new F250 and I knew this company produces the best oil and I also run this in my Dixie chopper.
Reviewed by Thomas:
Great oil for my diesel pickup.
Reviewed by Randall:
Great oil for street and track. Got my 996 oil analysis back after 6 months, multiple track days and of course...perfect results! Keep up the great work!
Reviewed by D:
The absolute best of the best. I use it in everything. Every engine I use this oil in has never given me any kind of oil related problems. If you want your engines to last this is the oil to use.
Reviewed by Otis:
This oil is used in an extreme situation. Been a customer for years. No issues or failures
Reviewed by Raycer:
I changed from the boosted version which lowered my my oil pressure way to much. Now my oil pressure never drops below 40 psi. With the boosted version it dropped to the 25 psi.
Reviewed by Johnny Racer:
I've been using this oil for 10 years in my 1995 BMW 325 which is a track/race car only. I put about 2000 miles a year on it and change the oil once a year. The engine is very happy runs like a top and I have 125,000 miles on it.
Reviewed by Keith:
I'm 65 years old and have been into automotive lubricants since I was a teenager. Out of all of the Automotive lubricants I have purchased and tested over the years. Nothing surpasses Amsoil products. Unlike most, I still change my engine oils at 3000 miles. That being said, I own a 1988 BMW M5 with almost 200K miles which still runs like it just rolled off the show room floor. There are many other brands and types of oils I consider to be excellent but nothing come close to Amsoil. It's the most trust high grade lubercants I have found to date and will NOT use any other brand.
Reviewed by Robert:
I use this in my old hot rods and love it again was useing other synthetic oils but none of them are close to amszoil.
Reviewed by Kubs:
I put this in my 2002 base model Corvette, and:
-became the overall Top Eliminator at the NCCC convention 2017. (although I'm not a drag racer)
-Finished 2nd in Autocross.
-Set at track record at Putnam Park race way.
-Ran all day - two days in a row- at a track event at NCM.
with all the things to worry about when racing a street car, I can check Oil and Engine concerns off the list.
Reviewed by Roy:
My modified Subaru makes over 100 hp per cylinder so I need a very stout oil. This stuff pours like water, but has a very high viscosity at high temps. It also has loads of zinc and phosphorus which makes it perfect for high horsepower applications, turbo engines, and american hot rods.
Reviewed by Joe:
350,000 miles on 98 Chevy, started using in the 90,000, don't have to worriy about oil changes , being over due.
Reviewed by LouFa:
Previously used Mobile 1 for years, but the specifications changed over time and didn't meet the GM specs for the engine. I transitioned to Amsoil and the engine ran even quieter and I know it's getting the proper lubrications that GM intended for the DOHC LT5.
Reviewed by Voganni:
Wonderful oil for older engines that can use it. I routinely run it for years at a time in my tractor and pickup. Neither uses any oil.
Reviewed by Scott:
There are no other decent high-quality 20W50 oil products around for this price. Cannot think of a better value, at least on West Coast. Engine runs just as dependably, even out of a tire slide, as when brand new.
Reviewed by Josh:
Use this oil in an old 1975 Chevy small block racing application. Like the high zinc concentrate
Reviewed by Ed:
The filler spout is too big to fit all of my bikes cars & trucks. Like the oil.
Reviewed by Allen:
Race application
Reviewed by XS:
I have never regretted the day I made the switch to AMSOIL products. I am currently using the 20W 50 Full Synthetic in my Race Engine 4AGE 20V Turbo Charged. Engine Runs way smoother, even the initial startup in the mornings is way quieter.
I have recently Purchased there
radiator Coolant and I am eager to have this installed. I am Happy, and Highly recommend AMSOIL Products to anyone who wants to protect there machinery, equipment or motor. A++ AMSOIL For LIFE......
Reviewed by
Scott:
Use this in my John Deere Diesel engines as well as my Chevy Trucks
Reviewed by Dom The Bomb:
The heacier weight oils are to die for if you own a rotary engine in a warmer climate. Amsoil delivers when it comes to their 20w50 synthetic oil.
Reviewed by Steve:
I am using this oil in my 68 Charger. And I am very happy with the results.
Reviewed by gene:
good oil
Reviewed by Steve S.:
Made the switch from conventional oil to Amsoil and appreciate the quicker startup, better throttle response & quieter engine operation on my 94' Discovery. 340K km on the clock & looking forward many more with Amsoil. Thanks for a great product & service!
Reviewed by mac:
I am using this oil in my 95 GMC Sierra SLE. with a V8 5 litre. The oil makes the engine run smoother and quieter. Gas mileage seems better. The gas needle doesn't drop as quickly. I have been using it for 2 months. so far no leaks, no oil consumption. Acceleration is good.
Reviewed by Small engine Dr.:
Oil lasts longer in my older vehicle and I don't have to add any between oil changes.
Reviewed by racer270:
i love the product , i drive less then 12,000 miles
and so i have been changing my oil once a year ,
since 2007 when i overhauled my dodge diesel engine.
in fact it's cheaper then running Dino oil ,.. and changing it every 3,000 ~ 4,000 miles.
thank you for the grate product.
GA.
Reviewed by HD:
Works great lasts a long time. Use it in my small engines. Lawn mowers , pressure washers, etc.
Reviewed by None:
Excellent product.
Reviewed by Brent:
I have a z turn mower with over 3000 hrs on one of the pump I have used this product to extend the life way past normal factory suggested hrs
Reviewed by Bob:
It's a great product, I even get,an extra 2 miles per gallon which helps a lot
Reviewed by Mike:
Best oil out there, checked dip stick after 2000 miles looks like I just changed the oil
Reviewed by PAUL:
Use this oil in my big block mercury marine 454 inboard engines. Makes them run smooth and quiet. there is never any problem starting these engines, even after being stored for the long Canadian winter. The oil also help performance with at least a 20 hp power increase!
Reviewed by David:
Since I started using this oil in 2006 I'm satisfied with its performance. I use it in a 3406E caterpillar engine. The engine runs cooler and more fuel efficient. Very happy with the ARO 20W/50.
Reviewed by Rob:
Great product , I have 3 high mileage cars that I change every 8-10k miles and they are running strong.
Canada
United States
Have used this product for years
Porsche 911 air cooled