Customer Ratings & Reviews

This is the best oil that you can get. You can see how well it's held up during oil changes. It's the only thing I'll ever use in my super duty.

I exclusively use Amsoil on all my vehicles and toys. The only negative I have is with the rewards. Why aren’t they just built in? I always get an email saying free this or free that but never remember what the code is. Why not just include it?

Using it on my 2015 Ram Ecodiesel, It immediately quieted and smoothed out the engine. I'm at 125k miles and no issues. I will continue to send in my oil evaluations for testing and hope to see this truck live a long and happy life. Looking to do my transmission next to prolong longevity and performance. Thank you Amsoil for a great product and for making kits specific to my vehicle, it takes the guess work out of it. Thank you,

I was driving over 4000 miles a week and only used Amsoil. The only oil that would hold up.

Do the math, after switching to 6x, I haven't had to add a single drop in over 10000 miles, and I only put on 10-15k a year.vs the previous where it was about a gallon a month. Still looks good after a year, love it!

My semi runs awesome on this oil

Always liked AMSOIL ever since I first started using it racing motocross. Now run it in all my equipment. Switching my tractor to it next.

I used this hydraulic oil for my 50 hour service on my Kioti CK 4020. Amazing! The hydraulic controls work much smoother and the whole machine is much quieter! Highly recommend!

Best you can buy. Can't beat it. I use Amsoil in all 4 vehicles and always will.

I was introduced to Amsoil and there products and glad so far I made the switch from Mobile. Will see how it it goes when I pull the 5th wheel RV next week.

Oil field, off road, 129,000 lbs, and on road grades up to 8%, off road grades up to 16%, pulling a super set of 108’ in combination length. The truck is a 2019 Peterbilt 389 with a 565 x15 Cummins, 18spd manual, 3:90 rear ends and lockers inside 23,000 lb housings. To date, the engine oil has been replaced with the 15w40 signature series as well as the Amsoil bypass system. The engine coolant has also been replaced with the Amsoil 1,000,000 mile coolant and the differential fluids have also been changed to the Amsoil Severe gear 100% synthetic 75w140. Under these extreme conditions, these Amsoil products are providing exceptional performance and durability. My truck is not building heat from friction caused by wear. The other drivers I work with are already complaining about their trucks building heat from the coolant temperatures to engine oil temperatures to differential temperatures. I have no such complaints. These products are truly the BEST in synthetics. Thanks Amsoil for keeping my truck on and off road and out of the shops

Winter time mixing with other AMS oils. Working very good.

I like the data backed science behind the amsoil products. I have had my amsoil analyzed by independent third party companies after various mileage intervals (5k, 10k and 20k+) and the oil still had good lubrication characteristics (tbn) at even 20k+ miles.

Can’t beat this stuff I run it in my F350

Smooth and easy Send my promotional product. That I asked for 3 times... Let's see if I get a response.

Good oil buy it

Much better starting in the morning on cold winter days. I don’t drive it very often now so I change the oil only once a year with this oil. That’s less than 5000 miles.

Been running in my 05’ 6.0 powerstroke and have great results

No issues for 20 years. I have used this product and will Continue to

I have been using Amsoil now for 2yrs straight. I started using this motor oil with my F350 dually, and also use the Amsoil 20micron filter. So far so good. I have seen the oil retain its viscosity better during my regular oil change frequency as compared to the Rotella T I was using (NOTE: Rotella T is great oil also). As a result, I have become an Amsoil convert. Am still sticking to the traditional Ford oil change frequency that is estimated by the truck's onboard computer (approx 7000mi), for the simple reason that oil is relatively cheap when compared to the price of a failed engine. :-) Last, from the information I have read I do think that Amsoil will extend the life of my engine (currently at approximately 160,000mi).