Customer Ratings & Reviews

I switched using my conventional oil to Amsoil in my duramax. The only reason I gave it a 4 was I need to see the results when I do a filter change. If it looks good then I will buy the oil bypass system to get cleaner oil.

Amsoil synthetic oil is by far the best oil on the market, keeps the engine cool, it has instant oil pressure, even in cold weather.

the only oil I use in my truck

The max duty product is second to none. Use with confidence. If you’re looking for a 5w-30/40 synthetic oil and truly want the best (actual synthetic blend) on the market that’s available to order and will arrive at your door fast…look no further.

I highly recommend this motor oil for all your diesel trucks.

This is the second time if used thin in my 2019 John Deere 2025r. It definitely makes the engine quieter and noticed a little smoother as well!

With the current inflation ridden prices on Diesel oil, Amsoil is no longer high priced. Signature series is great Oil.

Always performs well reduced engine temperatures when towing with my truck dodge 2500 Cummins diesel also my sons 6.7 ford while towing keeps temperatures down, I have been a dealer as well as a preferred customer 13 years Using Amsoil and still going strong Motorcoach, tractors and small engines

Excellent product and quick delivery

Great oil.

I had ordered 15W40, I received 5W40 by mistake, I had to pay return shipping and even though I had asked them to exchange it, they refunded my money and I had to reorder what I originally ordered in the first place. Product great, customer service awful.

Great oil delivered fast

Best oil ever!

I switched to this oil from Shell Rotella and I can say that I love it. Reduced engine noise, better gas mileage, etc. It’s pricey but it’s worth it.

From the moment I transition to amsoil diesel oil, my engine's performance as be spectacular, its as if all it's lubrication needs has finally been met, thanks to diesel oil amsoil outstanding performance

Absolutely the best. Period.

Will be running in the truck until she rots into the ground.

Good product for a decent price.

Amsoil is #1!

I've been using amsoil in my new 6.7 Ford diesel for 2 years. I use it in all my trucks we average 9,500 miles a month a truck per month.