I have a problem with my GTI 6 in which I have 500ml of oil coming up through the rocker to intake breather pipe within 50 miles of driving. I had this problem 12 months ago this carried on for a while and then suddenly stopped about March.

Since then I have had no problems at all, no loss of oil - nothing. Then last month I noticed oil in my air filter, took it out and it was saturated with cleanish - brown oil, within a week or so the same again. I have since rerouted the breather pipe into a 500ml plastic bottle which is filling up within only a few miles of driving, last night being 500ml in 13 miles.

History of the engine is little, however I bought the vehicle with a broken cambelt and reconditioned the head in my spare time at work, I replaced all valve guides, valves, stem seals, good quality head gasket and the car ran spot on for a couple of months before the first incident.

I posted a thread on here last year when it first happened, back then it was pushing oil into the intake, i put the pipe into a bottle then to keep it from going through. I compression tested it and the I cant remember the exact figures but 1 + 2 were extremely high and 3 + 4 were good, I did the test on my other gti 6 to see, and they all matched the results on cylinders 3 + 4. I cleaned out the breathers and booked the car in for a leakdown and they told me there was nothing out of the ordinary showing

After a few months it stopped completely so I put the breathers back and have not had any oil loss over the last 9 months until a few weeks back, and the problem has returned

I have questioned it being the rings or bores but what has puzzled me is the 9 months of faultless driving in between.

If i could get any other ideas on the problem that would be great

Cheers
Dan

breather system pipes. valve thing on the rocker pipe, rocker cover outlet themselfes,
the port into the block check they are all clear, take off the cam cover as the vents internal are enclosed in the cover,

how many miles on the engine bottom end?

maybe time for a piston ring rebuild

As said, it sounds like the breather system is blocked somewhere.

Inside the intake cam cover there is a compartment which the lid can be removed by undoing the torx screws and then you can inspect it.

As for the circular filter inline with the pipe, I personally would remove this and just run an uninterrupted pipe in place of it.

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"Supercharged - 454.1bhp/317.5lb/ft"
Peugeot 306 GTi-6
2000 (X), Moonstone

Cheers guys, the problem seems to have stopped. I took all the breathing system apart and cleaned all the pipes, took the cam cover off and washed the chamber, and ran the air line through the block. I left the regulator off the pipe, and have still had that pipe running into a bottle to keep check. All I've had over the last couple of weeks is a little oily condensation drop down, nothing that I'd be worried about.

Cheers again guys