Question on a 3500 with Cummins

Just bought a 2002 3500 Cummins Quad Dually. How do I go about finding out if it is equiped with keyless entry or not? The owner is unavailable. Thanks for any help. also any tips concerning the diesel engine. This is my first one. the truck has 69,000 miles. I was wondering about what oil to use. Thanks again.

I'm going to try amsiol on my next oil change. I don't like Delo, It smells bad, and breaks down pretty quick. Castrol seams to work well also, but it is not an extended interval oil. When you buy oil by the 5 gallon drum, it's nice to not have to change it as often.

I have used shell rotella 15w-40 with a wix oil filter since i bought my truck new in 96 and i have 478000 mile and have never had any touble at all. hope it helps