This is the first time I have used the signature series oil I always used the silver jug previously. I rate this oil so highly due to the instant noticeable increase in fuel economy after my most recent oil change. The big diesel runs at lower RPMs during all driving ranges and I have gained approximately 2mpg!

Love it

I've been using Amsoil in my 6.0 Powerstroke for almost two decades now highest quality oils available that's why I use it and that's why I recommend it

Great product have been using it for several years

Best oil I have ever had!

I have been using this oil in my long distance trucks for years. Cummins and Caterpillars Oil performance is what i hold in high regard and this has never disappointed me.

Only use amsoil I. My cars and truck. Won’t allow anything else in my motors

Awesome oil for my lb7 Duramax it has 306,221 miles on it and still running like new, iv never had any issues with Amsoil, I highly recommend it for any Duramax

I've been using Amsoil Signature 5W-40 Diesel Oil in my 2015 Ram 1500 EcoDiesel since it was almost new. I'm confident that using this oil has helped keep my rig going strong without issue for the 240,000km's that are on it so far.

Excellent service and delivery

All I using my Duramax

Amsoil is the best. I really feel that this oil has my back when I put my foot to the floor. The delivery service is excellent.

Learned about Amsoil by watching Greg A. On YouTube. Tried it in my 12 Ram 2500 (Cummins) and used it on both my 21’ 3500, and now my current 14’ 2500. Soon I will be ordering it for my 01’ 2500 (Cummins) I definitely noticed a difference in engine chatter(noise) after doing an oil change with Amsoil. Ram quieter and smoother. I won’t run any other oil. Thank your for the great product!

Amazing for my 2015 ram 1500 ecodiesel

Best product in the market, use it on all my motorized equipment, from my vehicle to chainsaw

I’ve noticed a big difference in engine noise after using Amsoil 15W-40 Diesel motor oil. The engine runs a lot quieter on Amsoil than the Shell Rotella T6 that I was using.

Never disappoints. Stellar oil analysis results, even on extended miles. The engine barely wears anymore.

Great products

Can’t say enough about this stuff! I’ve been using this diesel oil for years and I love it. I put Amsoil in all of my vehicles even the dirt bikes and the side-by-side! Everything! It is second none and if you want longevity out of your vehicles it’s a no-brainer

I trust Amsoil products in all my vehicles and they have never let me down. They cost more but they’re worth it. Also their customer service is outstanding!