Customer Ratings & Reviews

My diesel is a beast in real hot weather, but in Michigan we just don’t get the heat so adding this definitely gives it boost along with some better mileage!

Best oil ever

Best oil i've used in my old 2011 dodgeram 2500 6.7 cummins and i can run for 30000km per changes with the 15w40 400000km on her and still running deluxe!!!

First oil change with amsoil seems to have quieted most cummins clunks and ticks. Will see long term....

If you love your vehicle and want it to last, then use nothing but Amsoil Signature Series. Best oil you can buy in today’s market, nothing beats AMSOIL. Nothing!

Missing refund mailed back 3 weeks ago

I use this oil in a compact tractor with a turbo-diesel that works hard. The engine starts and stops smoother, runs smoothly, and I am confident knowing the level of engineering and chemistry that went into the Amsoil product that it will help me tractor engine be productive for a long time.

Great oil at a good price. Oil you can depend on.

I love your motor oil. I've used it in my Cummins for at least 12 years & I have had great luck with it so far! I change my oil once a year or every 10,000 miles.

Great Service and pricing. 3.0L Powerstoke in my F150 runs cooler and quieter! Thanks!

Best oil on the market exelent quality package for the product and always quick shipping time noticeable difference on mpg and response from beginning to end of oil life

N/A

Seems like a good oil, truck seems to like it! It arrived pretty quick too. What’s odd is after changing the oil to this oil (previously had valvoline blue 15w40, for the Cummins) I started to smell fresh oil out of the vents at stop lights/idling. I replaced a broken crankcase breather tube figuring that was the issue. Didn’t fix it and after some reading apparently that’s a pretty common thing with 3rd gen dodges and with certain oils. Odd. But the truck likes it and it stayed clean on the dipstick for a while after changing the oil.

If you’re working your truck, you should be using this oil, nothing less.

I have used this in my Cummins for 17 years and 300k miles. Never any issues with the engine

Good quality oil, will let people know more when I service the truck again for comparison.

Good oil

My oil consomption had reduce by half!

Love it! The engine is quieter, the dip stick is cleaner and I know she’s running with the least resistance possible!

Started using the AMSOIL Signature Series 15W-40 100% Synthetic Max-Duty Diesel Oil in my 2021 Gmc 3500 HD. I immediately noticed the engine running smoother and quieter. I've noticed less DPF regens, fuel mileage improment (from 568 miles a tank to 612 miles) a little power increase and engine oil temps around 8-10°F cooler. Very happy with the switch and definitely worth the extra $ for a superior product.