Customer Ratings & Reviews

I use my diesel 3/4 ton gmc pick-up to tow a 8000 lb. Travel trailer in northwest mountains. Never once did I worry about the extreme environment I was in

All Amsoil products blow away the competition. It is just a great product. I use the signature series in my diesel truck and change the oil at 15,000 miles. It just runs better. I have I have 254,000 miles on my Chevy 2500 HD diesel.

Best products on the market!

Great heavy duty oil have to order extra or remember to order in advance i dont have any off the shelf dealers local

Best oil that I’ve used on any of my vehicles!!!!

My diesel Duramax Chevy is towing heavy loads. I need the best oil, this would be the one! Engines are so expensive, don't skimp, protect your investment.

I own a 2004 Ford F250 with a 6.0 Powerstroke diesel engine. I am still running the factory injectors and high pressure oil pump at 200k miles. This is virtually unheard of; not if you're running Amsoil!

Engine noise has reduced, better startups. Truck feels a lot smoother. First time using this oil already impressed. 02 duramax

This is the best oil I have ever gotten. I feel like I'm spoiling my truck.

Great product.

I found my Ram Cummins runs cooler turbo Temps under a heavy towing using the Amsoil 5w40 synthetic by 100 to 150 degrees! Great product.

Purchase it cause I heard really good about it so I tried it. I have to say my 2013 duramax 6.6 sure loves it !!! No more clunking, or rough starts. Really impressed. Not ever going back to Rotella!!

I used royal purple for at least 2-3 years. My duramax literally ate at least 1-2 quarts a month. I switched to amsoil and used the same oil for almost two years and only had to add 1-2 quarts the whole time.

Used Amsoil for years. Always satisfied with product and service.

I have been using Amsoil for several years now. It consistently out performs other synthetic oils.

I installed the oil bypass kit one year ago and have only run Amsoil 15W40 Diesel through my engine. I wanted to test it out and find out how well this oil would perform and I was not disappointed. With 1 year and approx 25k miles on the oil, several long distance hauls with trailers between NC and TX, and AL and TX; I never felt like the Amsoil would leave me stranded. I have 100% confidence in the oil and all the Amsoil products.

Great oil! Really efficient and truck is running smoother.

Great stuff! Quiet operation. Its a great piece of mind using quality products. Amsoil needs to keep sending stickers!! Haven't been getting them lately with my orders...