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Oil pumped from the Oil Separator into Intake

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My 1997 Boxster 2.5L has started pumping oil from the Oil Separator into the intake manifold at a rate that will not only blow plumes of blue smoke, but also foul my plugs in like 30 seconds to where they must be replaced.

When did it start: On a cold motor I red lined the motor and wham oil everywhere, not into the intake tract at this time because the hose that connects the separator to the block blew out and oil was just running into my block, headers, and eventually the ground. Upon replacing this 1.5" x 2.5" hose, the oil started getting pumped into the intake.

Symptom: Drive normally, usually at a constant velocity all of the sudden the car starts to sputter and I look into the rear view and see huge plumes of smoke from the exhaust pipe. Plugs foul where the car will barely run. Plugs must be replaced.

Prognosis: Bad Oil Separator. I replaced the Oil Separator and the problem reoccurred in 13 min. I used the updated separator.

My Fear: The engine has bad rings, valve guides, hole in piston, etc that allows the combustion gas to pressurize the block and force Oil out of the separator.

I am open for suggestions and comments.


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Have you done a compression test? Also, can you post a picture of the oil separator since it gets confused. There are 2 air/oil separators in the sump. There is also an external part which is part of the crankcase ventilation system commonly called an oil separator. Jeff

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Hi Trent,

I have looked at your website in the past and like what you've done with the car. I am really sorry to hear about these problems. You think maybe the fact that it's supercharged may have something to do with a bad gasket somewhere?

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