Customer Ratings & Reviews

Driving 07 Chevy LBZ run this in the summer for the warm temperatures so far I have not had a problem

I’ve got a rare 2003 F250 with the 7.3 in it, bought it new. I’ve been running AMSOIL Synthetics in it (engine, transmission and differentials) with the dual bypass filter system since approximately 2010. Zero mechanical issues. Sure it may cost a little more however, the protection and piece of mind are worth it! Wouldn’t use anything else.

Heavy Duty 15-40 Amsoil is a great oil for my 7.3 in my 2003 F-350 my engine is protected from normal wear to the engine I cannot say enough to the protection it gives me for my engine! Thank you AMSOIL.

Lasts longer worth the price for the protection and the mileage/hours on my trucks and equipment.

Slowly Switching all my trucks fluids over to Amsoil. Truck seems to run smoother now that I’ve switched the engine oil over.

12 quarts of oil does the job perfect for a 6.7 Cummins for it to go tow 10k no problem.

Anywhere I use oil or fuel treatment I use Amsoil only excellent product

Good oil fast delivery I use amsoil in everything I own

Great oil for my 04 6.0 power stroke!

I put this oil in my 05 f350, 6.0. Immediately it reduced the clacking in my motor. I believe it's running more smooth too.

My truck runs smoother and less engine noise

best oil money can buy

excellent oil for me Diesel pickup easy starts ebven in the coldest of days in the winter and excellent protection

Considering the cost of a Diesel PU using any oil less than the best seems dumb. Never had any trouble using Amsoil.

This is a great Product (possibly the best) oil available I have seen the results first hand using amsoil in my chainsaws / mx dirt bikes / and my diesel truck. You can see the difference in quality right away where other oils are thin and watery amsoil is still holding it’s viscosity with over twice the length of time of top leading oils that are synthetic or not I became a believer after running it in my 2019 kx450 after running top synthetic oil before amsoil and running amsoil after it became clear that amsoil is superior to any oils I have ever used where I had to change my oil ever 7 hrs maximum amsoil goes beyond my oil filter time life of 15 hrs which is ridiculous amount of time for a kx450 I run amsoil in all my personal vehicles

Only oil I run in my 2008 F 250 6.4 which is still stock at 170,000 miles. It improve my fuel mileage and run cooler. I also run this in all my tractors best oil on the market.

This is the best oil on the market today and has been for 20 years.

This is the best oil so far n market . Don’t forget to get filters too

This is the first time I used this product. I think my Duramax runs quieter with Amsoil. Like how I can get 10 quarts in one jug.

I have a 2001 Duramax 2500hd that has had Amsoil since the first oil change. It’s got 300k on the odometer and runs like a watch. No oil consumption between changes (7500 miles). I believe the lubrication Amsoil provides is the difference.