It will not cook driving around town. Most turbos used water cooled
bearings too. THere is no need at all to let is run while you in the
store or during other errands unless you have two reason, one is you
want to let evenone know that you have a diesel and the second it you
want to make sure you are keeping the emmisions flowing for it too. .
I have run some heavy equipment on and off ove rthe years and when I
work one hard I may let it idle for a few minutes before I shut it
down to stabilize tempaturess but I do with gas equipment too. If
turbo diesels were as "fragile" as Max Dodge suggests, there would be
a lot of dead ones out there.
Why don't you stick with what you know - which apparently is limited to the
gasoline engines of the 60's and 70's.
Only the Duramax uses a water-cooled turbo - both the Powerstroke and the
Cummins turbo's are air-cooled.
While you are correct that just light driving around town will not get the
turbo hot enough to cook the oil (assuming it's a good-quality oil), coming
off the Interstate to a rest stop usually requires at least a couple of
minutes of idling to ensure safe turbo temps before shutdown.
Emissions? From an idling diesel? Do you have any idea how much LESS fuel
an idling diesel consumes vs. that of an idling gas engine? There's no need
to maintain a specific A/F ratio on a diesel... it could be as little as
100:1. Compare that to the 15:1 ratio of a gasoline engine, and you tell me
who's polluting more?
So you abused vehicles that you didn't have to pay for... big deal.
It's not like a turbo's going to grenade itself from being shut down hot
once. However, over time, premature bearing wear will develop if they're
constantly shut down hot. A little preventive action goes a long way to
extending the life of a turbo.
Don't the Holset turbos on the Cummins engines have oil cooled bearings? I'm
not familiar with the Powerstroke.
Trivia: The aircraft ECS turbine compressors that I worked on had air
bearings. Not air cooled bearings, air bearings. The shafts rotated on
That depends directly on the load being moved, which is not a given in this
The suggestion was that turbos (which ARE fairly "fragile" by inherent
nature) need some time to spool down. This means that rather than "ego", it
may be a matter of conservative maintenance or convenience on the part of
But hey, feel free to spit vile and crap based on your stupid (yup, its
stupid) opinion on the characteristics of diesels.
"There are four boxes to be used in defense of liberty:
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