Originally Posted by rstdave

Is the engine an old tired one or a recent rebuild?? My money would be on excess crankcase pressure, whereby yourrings are tired etc and you're getting blowby. Sounds like you're on std breather setup so i'd sort yourself out an uprated breather first off (as said by guy above), i had the same issues on the original engine in my rst which had done over 100k and running 16psi boost.......bailey breather kit and it stopped popping dipstick out/cap off. Obviously this is really masking a problem but it was a good short term fix till i could afford a proper rebuild.