Serviced my car yesterday, which is an '01 Astra with a Y17DT engine with 93k miles on the clock. On a whim, I decided to have a look inside the intake pipe, the one after the intercooler. It was coated in engine oil and there was a small puddle. I had a look in the pipe between the turbo and the intercooler and it was the same. The only explanation is that the turbo is leaking oil into the intake pipe, possibly due to worn oil seals. Is this normal for an engine this age, or is this a sign of the turbo that is going to blow?
The car runs just fine, doesn't really drink oil, there's no smoking apart from slight white smoke on hard acceleration when the turbo spins, however it has started to briefly hestisate more now when cold.
Thanks very much for your help in advance!