Customer Ratings & Reviews

This is by far the best Synthetic Engine Oil I have ever used and I will continue to use it in the future.

While I change my oil more frequently than recommended by AMSOIL. I have had no issues. 97,000 miles and get same fuel economy. Used oil is black but not metal on the magnet.

It’s nice to not have to change your oil 5-6 times a year

Been running Amsoil 5w-30 Signature Series Engine oil since 800 miles on my new truck 👍 Along with Amsoil EAO17-Oil Filter And Couldn’t be happier with the Protection Amsoil Provides !

Love Amsoil products they’re so worth it keeping our vehicles running well!

I have been using AMSOIL Signature Series 5-30 wt oil since my 2012 Subaru Outback was new (changed oil that came with car at 1000 miles). I always change my own oil and filter (AMSOIL) and now have 259,312 miles on the car. I have never touched the engine except to have spark plugs replaced every 50,000 miles or so. I also use AMSOIL Transmission Fluid without transmission problems. I trust the AMSOIL products to be the absolute best available.

simple, easy, efficient timely delivery as always

Upgrading to AMSOIL and the higher viscosity has made a major improvement in performance and making the engine perform more quietly. Ordering was easy and delivery was faster than estimated.

Knowing that I have amzoil in my engine crank case give me a piece of mine

There's not an oil that can beat Amsoil

Holds up better than any synthetic oil ive used so far. Fast and convenient shipping as well!

This 5W-30 weight oil is probably the best I ever used in. My car runs very good on it. I also buy the upper cylinder cleaner for the gas.

This stuff is the best stuff on the market.

I'm on my 3rd oil change with the Signature Series. After 5000 miles, you can still see through it. My oil pressure is up and my oil temp is down. I'll never use anything else.

Do you make oil for lawnmowers?

engine sounds and runs good

I use this oil on all my 3 vehicles. It has reduced Engine Noise and works very well.

I trust my vehicles to Amsoil always, don't be fooled by cheaper synthetic oils.

The best oil money can buy

This has been an excellent product and absolutely no complaints about the product it self. I change my oil every 3k miles it may be a little excessive but I know my motor is in great shape. I plan on using amzoil transmission fluid as well when I hit the 30k mile mork as well.