I have been using Delvac 15-40 in my 2004 Dodge CRD since day one. Currently at 150K miles. The oil is dumped every 5K miles and always use Cummins filters. A recent oil analysis by Blackstone revealed excellent results with a quote "this Cummins CRD appears to be in excellent condition". That is a good enough reason for me to continue using this oil.

I used this in my 2005 Victory Vegas motorcycle. It is getting very difficult to find synthetic blend motor oil, and with a larger range in viscosity. Victory (Polaris) recommends 20w40 synthetic blend motor oil. The Victory branded oil offered for sale is verrrrry expensive. Mobil Delvac 15W-40 is pretty close, and fills the bill, at a reasonable cost. Thanks Mobil

I like this oil for my wet clutch motorcycles - one air and one water cooled, my air cooler gas motorhome generator, as will as an air cooler twin cylinder riding mower. It has held up very well. The motorcycles and generator get low miles and low hours and I have no problem leaving the oil in for a year and a half knowing that the oil will still have a good TBN value still be neutralizing any acid build up.

Best diesel oil on the market. Don’t trust any other oil in my Duramax

Good product no rebate !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I have used Mobil products exclusively in my Ford Superduty. Lubrication is the cheapest way to protect your investment. They are the only name for my vehicles.

My truck engine has 1,200,000 miles and counting. I only use Mobil Delvac since new. I do oil analysis every 3 months and even after 12,000 miles, Mobil Delvac still have perfect lubricating properties.

I have been using this oil for years in my trucks and my farm tractors. I had to put new injectors in my 2001 truck and the inside looked brand new. No oil build up. CLEAN! You won't go wrong with this oil. Mobil Delvac 15W-40

I have been using Delvac in my 1930 Model A Coupe since I got it 8 years ago. I change my oil every 1500 miles and it is always clean and amber. The additives and weight are perfect for my old car.

I’ve been running Delvac 1300 Super 15W-40 in my 2017 GMC 2500 Duramax since it was new. Truck runs just like it did on day one. The truck has never been in the shop for anything engine related. Very pleased with how Delvac 1300 Super performs.