Customer Ratings & Reviews

I have 311,000 miles on my little insight. Change the oil every 10000 miles or so. Not a single problem with it. Product always delivered very quickly. good stuff.

I have used only AMSoil since 1982, best I have ever used.

Total reliability. Better fuel economy, cleaner engine, longer mechanical life. One higher priced change per year, but only one per year. Best product guarantee in the industry!

Use this for our 2009 VW Routan SEL Premium with 4.0L, and the van loves it! We have taken it up and down west coast numerous times without an issue!

Since we changed to Amsoil the mpg has gone up 5 mile /gallon extra on average. Plus in winter it is easier to start with the vehicle being parked out doors, huge difference. Change oil less frequently we can put on 20,000 miles/year seeing how I am in accounting if you extrapolate that experience over the millions of vehicles in the US, we could as a country save a ton of oil in petroleum used to lubricate and better gas mileage, what if the government alone changed to synthetics, wow.

Have several very hi mileage vehicles.. jeep with 300k Two F series trucks 300k & 400 k. So when we purchased new truck we put the signature series 5-20 and an Ea. filter on it. We feel pretty good about it.

Used in my f150 ecoboost engine, makes it run smooth, cool, quiet.

Amsoil has the best product on the market. I use it in all of my car and even my small engine equipment.

Use in all 4 trucks work and pleasure lawn equipment and Harley. Thumbs up

Absolutely Best stuff for extreme Arizona heat. Great piece of mind.

I have been running this oil and the trans fluid and been very satisfied . Amsoil does NOT ruin your gaskets and seals like some others which i wont name.

Great Product

I have used this product almost since the vehicle was new and enjoy the once a year oil change that this (and amsoil filters) allow. Now 200,000 kilometres and the engine runs like new.

Use this in the wife's Subaru Legacy. Used 44k exclusively and the UOA's are perfect every time. Can't recommend enough.

Love this oil. I use it in my Toyota Camry and 4Runner. Along with the dedicated amsoil oil filter it is great.

Due to the extreme heat in my area I, by choice opt to use the Signature Series 5W-20 Synthetic Motor Oil to protect the 6.2 motor in my 2011 Ford F 150 Limited.

I see the old reliable signature product I just bought has been reformulated for my next purchase. I hope Amsoil didn't fix something that wasn't "broke".

Being a new customer to Amsoil, I've read lots of good reviews and spoke with Amsoil Tech several times, and lots of satisfied customers before making the switch. I'm still a few thousand miles away before the first oil change and a oil analyst test. I also use Amsoil oil filters. With all the above sad, I'm very satisfied with the product and the help of all the technicians. Thanks.

Using AMSOIL products for years and has never, never been disappointed, ever!!!!!

I have used amsoil on my jeep srt8 2006 for 10 years. I have never had engine issues and I change my oil every 15,000 miles. If you need a good dependable oil for your performance vehicle, 0w-40 is the way to go.