Racerx296

When do I do it on my 05 3500?

HorseHauler

a lot of people tend to do there first one around the 2,000-3,000 mile mark just to get all the material out of there left over from the machining process. I didn't do mine untill 6,000 becuase i didn't know any better. no problems since and that was on my 03. i still do every 6,000-7,000 mile changes

rock

I did my first 3 at 5K then went with the 7,500 interval. No problems or issues.

bulabula

My dealer did the first one at 3500 miles.

Racerx296

very good then I will do mine at 3000 in about another 1000.

Thanks guys

Hoss

7500 miles.

drew03

i started at 5,000k and i have done all them every 5,000

N.Johnson

Got to wonder why the manual says THREE MONTHS or ....miles. Why would DC write that in the manual?

Yellowlab

I've had several reliable people tell me that these engines are not brand spankin new anymore when we get 'em like they used to be. I'm told that Cummins runs 'em, does performance tests etc, then drains the oil to get any metal shavings or anything else out. When we drive 'em off the lot the engine has already been somewhat broke in (obviously plenty more breakin in to do), and the oil changed once. Don't know for sure that's true...anybody offer anything on this??

Yellowlab

If the above is true, there'd be no need to make the first oil change before 7,500 miles, or whatever you decide your regular interval is going to be. 7,500 for me.