I run Mobil Delvac 15W-40 in all of our diesel engines of our farm equipment

Slow rebate check process. It shouldn't take over 2 months for rebate check to be mailed.

Have been running in my truck with no issues for 125,000 miles

This is the only oil we trust for our Diesel tractors.

I use it every time I do an oil change on my 2021 GMC 2500 DURAMAX I have had great luck with its performance and great price

I bought a low mileage 2006 LBZ 2500HD Silverado last fall. The original owner had always had the oil chaged at the local Chevrolet dealership. I changed the oil at my friends shop and he recommended Mobil Delvac 1300 Super 15W-40. Within 100 miles the engine was running much quiter.

I’ve been running Mobil Delvac 1300 Super for the last 12 years. 10 years in class 8 trucks and last 2 years in my Ram 6.7 p/u. Never an oil related issue. I also run Mobil Delvac 1 75w90 in my AAM Differentials. I use Mobil lubricants in everything I own.

I’ve been using mobile Delvac 1300 15W-40 I ordered and picked up my truck new had 8 miles on it I have 1,940,000 on it never touched engine C 15 cat other than routine maintenance tuneup‘s and easy Mobile Dale vac ever since I got the truck new

This is the only oil I've ever used in this truck and I'm at 435,000 miles with no oil consumption. I do use a 6 Qt. Gulf Coast bypass filter and change the oil at 10,000 miles, it is still clear with only a light tint to it.

The best oil I have ever used in my diesel truck I had a Cat motor went a million miles on it when i would climb a Mountain my oil pressure would stay up and stay steady if i used Shell oil my needle would bounce up and down I swear by Mobil Delvac.