Customer Ratings & Reviews

In my Excursion Diesel 250,000 miles

First, I'll say that I love Amsoil. I run Amsoil in every engine/transmission/differential/etc I own. I'm not sure about this new oil. My oil temp in a Ford 6.7 Powerstroke usually runs about 203 degrees (previous version of Amsoil diesel oil). With this new oil (December it might have come out???) I'm running 7-10 degrees hotter on average. I'll probably try one more oil change with it and if it still runs hotter, I'll have to find another brand.

I am astonished at the engine oil life provided by this oil, compared to the Mobil synthetic I used previously. I'm at 14000 km, 80% city, and the computer is telling me I still have 20% oil life. Previously I would get to about 10k and be looking to change. Admittedly I changed to Wix filter at the same time from Oem, so not a 100 % true comparison. Winter, with more idling, will be the real test. Engine seems to be running cooler even in 30C weather- that's hot for us!

I have a 2011 Chevy one ton dually long bed . Now over 100,000 miles and is running great I feel because I have used Amsoil since day one . I have used every brand with prior vehicles and always go back to Amsoil.

Use it a 09 Chevy Duramax, starts great even if it hits 0 or below

Buy diesel, gas oil plus PI for my gas vehicles. Amsoils is the best!

I currently use this product on my 2016 Ram EcoDiesel with no issues and have use the previous 5W40 diesel product on previous diesel pick up trucks and heavy-duty equipment with no complaints. Thank you Amsoil.

I'm running the 15w-40 Amsoil Signature Diesel in my Corvair air cooled engine in my 22 foot RV. Very heavy duty use for a 3 liter engine from the '60's, and it performs perfectly, along with the Amsoil 75w90 Severe Gear in my differential, and Amsoil ATF in my Powerglide transmission. I use nothing but Amsoil products in my 17 Prius, the 16 Subaru Forester Turbo, And every car I have owned in the last 15 years, and will continue to do so.

I like to take extra care of cars that I love. For those cars, I only use Amsoil products. Why? I trust and appreciate the information and research they provide. I'll pay extra for that trust.

Best oil out there. Installed a bypass filter system as well. Very happy with all aspects. Installation was simple

Yearly oil changes, how good is that!

Engine ,primary and transmission fluid for my fxstdi.

I have been using Amsoil for many years. Amsoil is the only product I put in my machines! If you don't have time or inclination to change your own oil, buy and take it to whoever does your oil changes you will still safe money and your vehicle will love you.

I run this oil and only this oil. Do changes every 20,000 miles and never have to add any oil during this time.

My son uses Amsoil in his 2011 Ford F350. He has many mods on his truck. This is the only oil that he trust.

Amsoil is a great oil. I personally change oil in 8 automobiles and light trucks. Also 1 motorcycle and two lawnmowers. My highest mileage is 200250 miles. I can tell you that Amsoil and their filters will do a superior job. The only down side is the shipping charges. Amsoil is priced about the same as Mobile 1, but the charges mean you pay top dollar.

I'm using this in my diesel pick up. I can't believe how much smoother it runs. And the mileage improved so much I thought the trip computer was broken.

New 2017 ford diesel. Outstanding oil. Highly recommend it. Would only use this oil in my new Diesel engine It is so high tech

Ran for 8 thousand miles & love it so far

I use it in conjunction with the Amsoil bypass filter. Usually Change oil after 20,000 miles or so. It's great oil, as is your trans and differential oil.