Turbo cool down? Service intervals?
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This is a discussion on Turbo cool down? Service intervals? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; One of the trucks I drove for work a few years ago was a turbo diesel truck, and my boss ...

  1. #1
    Registered User RichD514's Avatar
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    Turbo cool down? Service intervals?

    One of the trucks I drove for work a few years ago was a turbo diesel truck, and my boss was very insistent that I let the truck idle for 10 minutes after a long run to cool down the turbo. There was also a sticker next to the ignition about how important it was to cool down the turbo. I have heard about that before, but I'm not sure if its necessary in all turbocharged vehicles. Should I idle my 2012 wrx after a long and/or hard run to cool it down?

    Also I'm concerned about the recommended service intervals.. They suggest every 7500 miles or 7 months.. I know its synthetic oil, and you can go farther with synthetic between oil changes.. But 7500 seems like a lot. I also don't drive a while lot. I have a van I use for work, so since I got the car in may, I've only done 1200 miles. Id feel comfortable doing service every 3 months, but am I just wasting money doing it that frequently? Also should I be doing my first service sooner since I have no idea how long my car has been sitting around with the oil in it from the day the engine was built?
    Thanks!

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  3. #2
    Registered User UEDan's Avatar
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    You do NOT need to do a cool down cycle. Our WRX/STi's have a secondary coolant reservoir that cools the turbo after shutdown.
    Although it has been mentioned before that if driven VERY hard, as in tracking the car a light cool down drive is recommended.

    Service interval is a huge debate. But the general consensus is: Subaru built the damn car, did all the R&D. Who are we to say they're wrong.

    Hope you're enjoying the car!

  4. #3
    SPT for the win! lashak's Avatar
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    Quote Originally Posted by UEDan View Post
    You do NOT need to do a cool down cycle. Our WRX/STi's have a secondary coolant reservoir that cools the turbo after shutdown.
    Although it has been mentioned before that if driven VERY hard, as in tracking the car a light cool down drive is recommended.

    Service interval is a huge debate. But the general consensus is: Subaru built the damn car, did all the R&D. Who are we to say they're wrong.

    Hope you're enjoying the car!
    Great advise! yea and if you listen when you kill the engine you can hear the turbo coolant system kicking in. however take it easy on the engine until it warms up a little. let the engine get a little warm before running it hard.
    Speed has never killed anyone, suddenly becoming stationary… that’s what gets you.

  5. #4
    Admiral Ackbar mycologist's Avatar
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    The coolant circulates due to the temperature differential, and no you don't need any cool down or a turbo timer etc. Best to take it easy the last few miles though.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    Administrator RayfieldsWRX's Avatar
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    Quote Originally Posted by mycologist View Post
    The coolant circulates due to the temperature differential, and no you don't need any cool down or a turbo timer etc. Best to take it easy the last few miles though.
    This. I find that the easy drive through my neighborhood to my house is sufficient.
    --Ray
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    Dimensional Drifter Rambo's Avatar
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    +1

    Also, you don't really hear the passive cooling system "kick in", the car just ticks for a little while as the hot metal cools. It's an ingenious cooling system that requires no power, but just uses the laws of thermodynamics to circulate the coolant, as myco said.
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  8. #7
    Registered User RichD514's Avatar
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    Very informative! Thanks for all the input guys!

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