Hey All,

Noob here, and I did an extensive search with "cool down" "shut down" "idle" etc... and I'm still not completely sure what the answer to this question is:

1. Does the 2007 2.0T A4 Turbocharger need a "cool down" period when I shut off the engine, or does it have the "automatic fan" thing that will circulate the oil even with the engine off?

I found a thread that said it will circulate, but I'm not sure where the person got the source (owners manual? Audi website?). If someone can confirm for me with the source, it would make me (and other 2.0T new owners) sleep a little better at night when I forget to idle my car after parking.

Thanks in advance!

If you do that then there's no real need to idle before shut off.

There is an after run coolant recirc. pump. If your turbo is water cooled, you probably get a little bit of coolant running through there after you shut off the engine.

A3 is traverse.
A4 is longitudinal, & I don't think the pump is there.

I've noticed that when I shut off my car after running it moderately hard there is a fan that stays on... is that whats cooling down the turbo, or am I completely off...

*Face Palm*

Just idle it for 10-20 seconds or as earlier stated take the last couple miles easy before u park.

i asked that from audi west covina service director jim lynch and he said to let it cool down for 10 sec before shutting off just to be safe but its not really neccessary he said

All VW/Audi 2.0T engines have the ability to "reverse" pump the coolant through the turbocharger housing. This is automatically controlled and will only occur when necessary. The idea is prevent coking of the oil on the impeller/turbine shaft, which can eventually lead to turbo failure.

*Face Palm*

Just idle it for 10-20 seconds or as earlier stated take the last couple miles easy before u park.


what he said.... even after a 3 hour drive with a trailer on the interstate AT SPEED, there is always the off ramp and slow side road before you shut down....
if you think about it for a sec, easy driving while moving is better than sitting still idling with no air movement :)

IMHO (and chevrons) coking of the oil in a turbo engine has been an old wives tale for 10 to 20 years....

With the newer oils - especially synthetics - and better tolerances on turbo bearings, etc.... you won't have a problem unless you drive at FULL boost for 30 minutes with a trailer behind you going up a 20% grade and shut it down immediately...

Been fighting this myth in the turbo diesel arena since my first turbo... YRMV :)

IMHO (and chevrons) coking of the oil in a turbo engine has been an old wives tale for 10 to 20 years....



The problem isn't coking in the engine, it's coking on the shaft inside the turbo. It's a well-documented fact that it can (and does) occur. In fact, read VW/Audi's own engineering literature and you'll see that they specifically designed the cooling system to pump coolant to cool the turbo after shutdown. And in their own words, they designed this feature to "prevent coking" in the turbocharger.

After you turn the car off you can here the coolant moving. There shouldn't be any need to sit there and let it cool down. The car does it for you.

oh, I didn't detail coking in the turbo ! I used the generic engine ... my bad...
you are probably correct then if Audi said it - good find !

I'm a small sampling size, having had just 4 or 5 turbo'd cars since the 80's - the 89 turbo engine I had did have the auto cooler when shut down and the newer versions did not, the mfg said there wasn't a need for it any longer....

guess like our outdated navs on our new Q, the turbo's are old school too :)