Reply With QuoteValve guide seal is first suspect... sometime the valve guide get loose and then that would mean the valve guide too.
Grand Master
Repeated oil fouling of spark plug #1
Repeated oil fouling of spark plug #1
What would cause this? Leaky valves? Valve guide seals?
EuroLux:. Private Detail
E34 1/'89 ///M20 2.5i: Lachsilber
4 Grand Master
Valve guide seal is first suspect... sometime the valve guide get loose and then that would mean the valve guide too.
Green Beret Special Ops
Try a hotter plug for now. If at any time your thermostat was stuck open it could have caused extensive ring cylinder wear. The intake valve guides can do it too as mentioned. You could try to replace them while still on the car, not absolutely hard to do.
95 E34 530I V2.37
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