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Old 10-15-2016, 01:20 AM   #28 (permalink)
It's all about Diesel
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Apart from the previously-mentioned defrosting issue in colder weather, the only other circumstance that would make me consider keeping a car idling a little after the start would be to not overstress the valvetrain before the oil starts to flow.

Originally Posted by niky View Post
I'd heard Cummins (or Caterpillar?) injects the extra fuel post-cylinder, straight into the exhaust. I still don't understand why other makers don't do this. Doesn't even have to be one of those fancy high-pressure piezo injectors... could be done with a regular old-tech injector.
Blame it on the bean-counters.
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