TURBO OIL TEMPERATURE

[SIMON HOLTBY]

I have noticed for some weeks now that my car is dripping oil on the
garage floor and have located it as comeing from the oil return pipe from
the turbo.
Please correct me if I am wrong here but when the car is not running there
is no oil in this pipe as it will have drained into the sump. When I
removed the pipe there was no oil in it. So if this pipe is dripping
without the engine running when it is running and there is oil under
pressure in the pipe it must be spraying out. However I cannot see any
sign of this under the car but oil consumption has increased.
What pressure do you think is in this pipe. The supply pipe I would think
is at the pressure that would be shown on a pressure gague if I had one
fitted in my car say about 4 bar. But as the return pipe is twice the
diameter it may be 2 bar.
Audi quoted a price of 120 gbp plus tax but I have found a local company
that will make me a pipe for 30 gbp. My main concern is what temperature
the rubber part of the pipe has to cope with. I'm a little confused here
because I know turbos can get to hundreds of degrees but oil cannot cope
with anything like this. So I guess the oil passes quickly through the
turbo to avoid breaking down. I need to tell the guy how hot this hose
will get.
Thanks in advance..

Simon Holtby
'84 urq

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