Both them ideas sound plausible, do you know what breathers tend to get blocked? Are the PCV's prone for failing?
Also the gt28 had a braided oil feed and i just found a random banjo to fit it to the gt25 as it was a different thread to gt28, i wasn't aware that it required restriction for the oil flow so that could also be causing me a problem.. What size restrictor would you recommend? 1mm? 1.5mm? Thanks for you help!
Tom