Finally found the leak(s) - Closure Notice Thanks for all the input guys! I had probably told you that the leak had plagued me for some time. And to make matters worse, I am in the States on leave about twice a year for 3-4 weeks, so I am always pressed for time. Anyway, with the leakage I had what I think was a combination of leaks. The oil return hose rubber elements were leaking, but not much. That was taken care when the engine mounts were changed. (see above). But there was still a substantial oil leak. More engine washing and inspection by me and my trusted mechanic told him that the oil pressure line fitting to the prop governor was the culprit. That was easily fixed with Teflon. Admittedly I was sceptical, but after return from two hours flight, there oil leak was gone. I was very happy indeed. Now all I have is a little oil mist inside the gear housing, but it barely moists a paper towel when wiping. The horrible streaks on the belly have gone, and with them the anticipation that the engine might have something horribly wrong with it. Flying is much more relaxed now! I really have to thank my mechanic (an old hand), and we had a few beers to celebrate. Chimpanzee