Ive gone a little further down the road today. and think I have narrowed it down to a big end on cylinder 6.
First the positives - Cylinder liners look lovely, now scoring in slightest, very very smooth, and not even a noticeable lip. I'm impressed for an engine of 120k miles. Piston tops look in good condition, other than carbon layer. Cylinder head looking ok, filthy though!!
So, focusing on piston 6, I done a little video per this link.
Code:
http://www.youtube.c...eature=youtu.be
So now what?