I am new to the diesel foray. I have heard from some people that you need to cool the motor for a few minutes after driving. Do you have to do this every time, or just after running at freeway speeds when the turbo kicks in. Any suggestions are appreciated!

Boost is what? :think: EGT's are what? :think: How hot is hot? :think: ........ I'll fill ya in a little but you should do a search. Oil "cokes" a turbo :nono: :shake: --> look that up and you will find ETG's and how Boost affects temp's. ;)


BTW, I see this is your first post. "Welcome to the Diesel Place" :D



Burner------------------------>:D

I found this on the Banks website. I frequently direct friends to this page when I get tired of them out gassing about my diesel.

I have an EGT gauge on my Duramax. After a hard-long pull, my EGT's have always dropped below 350 after, say, 15 sec of idle. This is a very fast cooldown compared to the big 14L motors.

Out of habit I still idle prior to shutdown, but it probably isn't all that necessary.

Here's the article===============================

Q: You have to let a turbo-diesel idle for two minutes before you shut it off.
FACT
A: This is a current myth that has a basis of fact stemming from many years ago. It also has a kernel of truth regarding today’s turbocharged gasoline engines that operate at higher peak exhaust temperatures than turbo-diesels. In the early days of turbochargers, the turbo shaft was supported by a babbitt bearing that could seize, or even melt, if the engine was shut off immediately after sustained boost conditions where the turbocharger would “heat soak”. A two minute cool down at idle allowed the turbocharger to dissipate any remaining spinning inertia, and the oil circulation cooled the bearing and prevented oil “coking” in the bearing area. Turbochargers haven’t used babbitt bearings for over 30 years, and today’s oils resist coking. Synthetic oils won’t coke, period. With a turbocharged gas engine, it’s still good insurance to let the engine idle for 30 seconds to a minute to allow the turbo or turbos to dissipate any inertia and to cool the bearing area to prevent oil coking, especially if the engine has been worked hard just prior to shut-down. Of course, using quality synthetic oil eliminates this potential coking problem.

Today’s turbo-diesels are a different story. There is really no reason to “cool down” a turbo-diesel these days, but you won’t hurt anything by doing it either. You can still find people who swear you have to do it, but the myth is fading. Maybe they just like to sit and listen to the radio.