Re: Oil spots on air filter

-->> T.G. Lambach <<-- wrote:
> I can't help you on the vacuum system's details but the theory is that a

> leak somewhere allows air to be pumped into the motor (via the pump) and

> that excess air blows lube oil into the air filter. A Mity-Vac (or 
> similar name) vacuum pump can be used to find vacuum leaks.
> 
> I (eventually) found that my 617.950 engine blows oil up the air 
> cleaner's oil drain pipe on hard acceleration, staining the paper air 
> filter, whenever the oil level was too high due to careless repair shop 
> overfilling on an oil change.
> 

A belated thanks TGL for the info. I have been 
bogged down with other things recently and will be 
looking at this problem again soon.

This is the first time I have seen lots of 
discrete oil drops. The filter normally has a
uniformly sprayed look in places and moderately 
clean at others.