Customer Ratings & Reviews

I recently had the little 5.3 L83 in my 15 Silverado freshened up with goodies from BTR, Frankenstein, GM Performance and the list goes on. Engine Dyno’d at 450 whp. At 8,000 RPM. I was using mobile 1 oil but at high rpm it didn’t feel smooth so I rarely got on it. Until I changed to the Amsoil Signiture Series OW-20. Now I do multiple pulls to 8,000 a day and the engine runs smooth as glass, also haven’t been burning as much E85 either. I’ll never use an other oil again and can’t wait to change my transmission fluid to Amsoil as well. Performance oil! Insane!

Got a used car with 100k miles and after reviewing and comparing having used amsoil with my old car this is been the oil that keeps the engines running like clockwork. Old car with 300k and starts like new thanks to amsoil.

The oil tests extremely well in lab tests, I highly recommend using this oil above others. I've used it in fleet applications and personal vehicles and I can vouch it'll hold up any type of usage rather you're a ride hailing driver, someone who does ride share or you're just a casual over the road driver... Absolutely, Amsoil has you covered. Check out their other products and see the results for yourself. You cannot go wrong. I've used their OE/XL & SS lineup. 0w20, 5w30 & 10w30.

This is my go to in-between with my local dealer in Tulsa ok off of 51st street and south 95th east Ave. MR Pat Grady, hellava guy. He's the main reason I've stuck with this brand.

I use this oil for every engine I have. 3 vehicles and a lawnmower.

Great product for a 1999 Ford truck with over 200 k miles. Does not burn oil at all.

Product works very well as described.

Just received the oil report for my 05 Corvette, which has 125,000+ miles. I have owned this car for 18 years and have the oil tested at least once a year. I just switched to Amsoil from Mobil 1 the last oil change and the comments from the lab read as follows: Spotless results from this oil sample. Wear metals are some of the best we have seen in recent history after the longest oil change interval on the page. Five other oil change test results were shown, dating back to 2018. Metals like Aluminum, Chromium, Iron, Copper, Lead, and tin were down significantly. I am happy I switched all of my cars to Amsoil.

I'm running this oil in my 1999 Chevy Silverado 1500, with 220,000 miles on it. The motor runs quieter, and my oil pressure actually increased by about 10 lbs at idle. Why I don't know but I'll take it. I've always been happy with AMSOIL. I run it in everything I own.

Use it on my 2006 Toyota Tundra

Use it on my 92 Chevy 454 with 207K on it.

I have a 2003 Tahoe with 300,000 miles that had a slight leak. It had Castrol conventional for all 300,000 miles when I bought it from family member. It leaked like crazy when I switched to this oil. I went from a quart an oil change to almost one a week. I switched back and now I’m back to normal.

The oil is going on 3000 miles and hasn't lost a drop.

Excellent product

I change my oil and oil filter every 5000 miles with AMS Oil Signature Series Synthetic Oil (5W20), even though this mileage change interval is not required. My 5.7L Hemi engine runs smooth as silk, and doesn't consume any oil. I love this oil, as it keeps my engine running in tip top shape. I highly recommend it to anyone.

Just what my 2 L turbo needed.

Real synthetic goodness

I have been using this in my wife's Fusion since it had 80 thousand miles. We change the oil and filter regularly every 6 to 8 thousand miles. Last week, I had the timing chains replaced. The mechanic said that, at 250 thousand miles, the guides showed almost no wear and the internals of the engine look almost new. I will be using this for the next 250 thousand miles and will report on the condition of the engine at that point.

I saw some YouTuber saying this makes his car feel like new. I thought he was just exaggerating. But when I put it in my 147,000km Subaru, after around 160km, it felt so smooth that I can only describe as “a new car”. My car never felt so smooth. That’s with all kinds of additives I tried over the years. It’s like it’s made for each other! Not kidding!

I have used this oil in my Toyota Highlander since day 1. 100k miles and still runs like new.