6.7L Cummins Forum

Guys,
I have read on other threads that you should not warm up your diesel on a cold morning start because of soot build-up, especially on the 6.7L. At times, I have used the high rev only to get the fluids moving and only for 1-2 minutes.

Now from where I live, I can be on the interstate within a 1/4 mile; therefore, I'm getting up to 60mph while the truck is still quite cold. I've noticed that the truck will remain in 5th gear and run at 60mph for about a 1/5 mile before going into 6th gear. Shortly thereafter, the truck will begin to show warming up.

What is more harmful to my truck, warming up in the driveway, or pushing it down the interstate while cold? I guess I should point out that my drive to work is less than 10 miles. Therefore, I know that it is not long enough to complete a regen, so I'm prepared to make long runs down the interstate for a beer run.

Ever since I became a diesel mechanic I have not been an advocate of an idling engine. It would bother me with my fleets to go to a yard and have 30 trucks idling away and no driver in sight for hours. The old school train of though has told us diesels like to run, well they do, but loaded is where they prefer. I have had several diesel service trucks and would only idle them if I needed to stay warm but would shut them down if I wasn't actually in the cab. I have run my 6.7 at low rpm's and idled it for some pretty lenghty times only because of the nature of the work needed lots of lights or real slow speed moving. In the mornings It idles (high with the EB on) for about a minute then I proceed to the freeway, slow speed driving into the parking lot cools the turbo down enough and It gets shut off. Try explaining cool down time to the wife, it does not happen, we have made hard pulls and exited then shut the engine off right away to make the pit stop, no signs of problems yet. Just my worth

__________________
07.5 3500 Quad, SRW, 4X4, Laramie, Leathered, Dark Metallic Gray, 6.7, 68RFE, 20K Reese, Ride Rite's, 2 Viair air compressors, Bully steps, Kleinn Locomotive air horns (5 in all), Billet polished locking fuel door, 'A' pillar mount Auto Meter Pryo, PML X-deep trans pan
06 Durango 285 RL 5'er Lifted by KZ