Customer Ratings & Reviews

Great products and 💯🇺🇸 made. Customer for life!!! I love the guaranteed protection on the parts the oils come in contact with. Switched from R**** P***** after using them for 13 years and can tell my motor is running smoother.

I used this for my newly rebuilt 1990 Jeep YJ 4.7 stroker. 4.2 Jeep motors were known for noisey lifters after the engine is up to temp. This oil has dramatically quieted my motor down. My oil pressure is 7psi higher at idle and 12 psi higher under load. This is compared to Rotella T6 15w-40. My cold start lifter tap is HALF the time (in seconds) that Rotella was. Let's say Rotella was 2-3 seconds of noise. Amsoil Diesel 5w-40 is 1.5 seconds of tap in the morning on a cold start. I was a faithful Rotella user for years. Well now I am loyal to Amsoil.

wanted up upgrade to the 5W-40 for the winter starting performance over my previous 15W-40. The oil pressure does come up a little faster.

made the switch to Amsoil based on previous experience using 10W-30 in a 86 Bronco II and a 88 straight 6 F250. Also, reviews from a couple of diesel forums gave good reviews. i have made 3 oil changes to my 6.7L and the oil coming out doesn't seem to be as gritty as the syn. penz. i was using.

I decided to use this oil in my 2015 F-350. It seems to be doing much better than the old oil I was using. I will be using this oil from now on.

Good oil for a reasonable price super quick shipping. Great staff to deal with.

It gives peace of mind knowing that the engine is protected.

Exceeds standard. Great product

Have been using Amsoil for over 38 years

It’s comforting knowing your using the best product available.

I run Amsoil in everything truck I own.

AMSOIL makes absolutely first class products. I have never had an issues with their products. This particular oil saved a motor in a truck of mine that blew a head gasket and dump all the oil but 11/2 quarts. The mechanic who redid the head gasket was astonished that the cylinders and cylinder walls look like a brand new block with 100% of the cross hatches still intact.

I’m happy to afford the best oil for my Cummins motors. They work hard to make me money and deserve the best.

I have been using Amsoil for over 10 years now and totally pleased with the product. I have a 2001 F350 7.3 have 257,000 miles Plus the fact it is delivered toy your door within days.

Great stuff, only change every 25000 miles

Works well

First time using Amsoil. I did a lot of research and follow an R&D company in California that produced video segments on your production process. I have noticed a difference in my Cummins engine running. It does seem smoother and idles better. This is going to be my new engine oil from now on.

Got turned on to Amsoil a few years ago and will have to say it is the best thing that has happened to my 05 F150 5.4 3 valve, the notorious engine loaded with issues. Since using it, oil consumption-gone, engine noise-almost non-existent.

I highly recommend Amsoil products to anyone who is interested in keeping their diesel or gas engine running far longer than any other oil. This is especially true for anyone who uses their diesel vehicles as hard as I do. I keep up with the maintenance but I haul trailers with loads of 10,000 to 14,000 lbs sometimes 1,000 to 1,200 miles at 75 to 80 miles an hour. I rely on Amsoil to keep my pickup going and I haven’t had a oil related failure with my current pickup or the last two that I owned. Can’t say about the oil I was using before.

Extra protection for the truck. All lubricants have been changed to Aimsoil.