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Discussion Starter #1
Hi Essex Turbo,

Wanted your advice on turbos. My previous car is a Honda Accord and the user manual suggests the driver allows the Accord to idle for 2-4 mins after a long journey to allow the turbo to cool down properly, rather than just switch off the engine.

Is this the case for BMWs too? I have an E70 3.0sd turbo diesel.

Also, my car has 90k on the clock and done motorway miles. Is there anyway to 'test' if the turbos are coked up? eg drive up a steep hill and then kickdown to see if a plume of black soot comes out?

Thanks in advance.
 

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Yes, it's very important to let turbo cool down. It spins much faster than engine. 150,000rpm. 2-4 minutes seems a bit excessive though. 30 seconds should be enough. I don't rev the car a couple of minutes before I get to my destination so don't need to let it idle.
 

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Thanks for this info.

Good to know as I do try to take care of my wheels as been burned by costly bills in the past.

I also try to idle a bit at traffic lights etc....so turbo already running at lower speed.

Cheers.
 

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No worries.

Another good thing to do to look after turbo is not to rev it when it's cold. Let the engine get to temperature before putting your foot down. Apparently the oil takes longer to warm up than the coolant so the temperature gauge is only and indication.

PS: Letting diesels idle at lights is good idea. Just don't idle it to warm it up.
 
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