Quote:
Originally Posted by 2004NBTURBOS
It is best to drive the car easy before shutting down. Meaning stay out of the boost. Turbos generate a lot of heat. The more your in the boost the hotter the turbo gets. If you regularly shut off the car with a hot turbo the oil passages tend to cook the oil, and get clogged with sludge. This happens over time, so to avoid this problem it is best to take it easy for a few miles before shutting down.
|
Just to add--yes, if you are on the boost hard the turbo can get very hot--compressing air creates lots of heat and shutting down the engine at such a time will "cook the oil"--it's commonly called "coking", or essentially the oil is broken down by the heat creating some nasty gunk. Even synthetics can be broken down depending on the temperature--have you heard the term "turbo timer"? Essentially, a turbo timer is a device that keeps the engine running after you reach your destination, stop and turn off the ignition and leave your car. Personally, I try to avoid hammering on the boost when I know I'm about to stop and/or I open the door, while letting the engine idle, the door chime is a good timer of about one minute of idling for oil to circulate and cool the turbo to a temperature that should be oil safe.
