Customer Ratings & Reviews

I ordered this by mistake, it should have been 5W30 Sign

BEST OIL ON THE MARKET. IT INCREASED MY FUEL MPG ON HIGHWAY FROM 36 TO 41 MPG

Only use Signature Series in my vehicles.

This is the best oil I've ever used. I've been using Amsoil for years and it has really made a difference in performance, and engine temps.

I was looking for a good motor oil for my truck. Looked at several different brands before speaking with others that used the same AMSOil 0W40 I was really impressed with what other people had said. So I've using it ever since.

I have been using Amsoil for over 20 years, PI is a great product that gains fuel mileage for any vehicle. I pull a snowmobile trailer to NY several times a month in the winter. I recently purchased a Ford F150, the first time I pulled it I got less than 10 miles to the gallon! After having PI in the tank for 1000 miles, my fuel mileage was almost 11 miles to the gallon. It's a great product.

This is the oil I use in my vehicles, great product and highly recommend.

Used to use a different, but my friend informed me about this oil and since that day Amsoil is the only oil I use.

Great stuff. Have a 2012 Silverado that occasionally had valvetrain tap on cold start. Haven’t had it happen since the switch

Amsoil is the ONLY oil I use on my cars, and motorcycle. I truly believe it's the best.

AMSOIL signature series is the only oil my vehicles have received in at least 15 years. Although the recommended weight for my Subaru Outback is 5W-30, I use this oil for additional cold start flow. With an EA 15K filter, it's the perfect solution for once per year oil and filter service.

I have used this type oil and recommended oil filter on my 2012 Honda Accord V6 coupe after the initial Honda oil used for the first 10k miles. I change both oil and filter every 20k miles. I change the auto transmission fluid every 100k. I also normal maintenance as per Honda specs. I rarely if ever add any fluids between changes. As of today 03/07/21 the Accord has 343,000 miles and counting!! No repairs or replacement of motor or trans. Great products!! Great car!!

I am amazed at the difference an oil can make. My engine runs much smoother and I have seen an increase in mileage. I have gained approximately 35-40 miles per tank.

When you want the best Noticeable difference.

There’s no competition hands down best lubricity on the market. Do yourself a favor and make the switch to amsoil. Thank you for a superior product!!!

Great oil. My Mechanic says this oil is the best for protection and anti clogging he's seen. keeps everything clean. Turbo benefits too

Using amsoil signature series 0W30 on my 2018 ford raptor 3.5 ecoboost during colder months from Oct - April, our winter temps are as low as ‐40⁰C. I switch all my vehicles to 0W30 SS during these cold months.

Fast shipping.Great products. I've been using Amsoil in all my vehicles and toys for last twenty years.Even my lawn mower.Best oil ever!