Thank you all so much for the time you're putting in here. I'll let you know the results after a bit of delving.. Answers to your questions, M. so questionee,s 1, what oil is in it - 20:50 Castrol classic 2, when was it changed, as it may have actually worn oot, and just now reverted to a 20 grade only. Changed very recently after the heads were clamped down. (100 miles or so, ago. 3, what oil did ye use to run it in, specs needed 20:50 Castrol classi 4, head re torqued - yep. 5, oil on piston tops - TBC 6 oil coming frae spark plug side - TBC 7, the engine breather is working I take it.!!! M[/quote]