Gents,
I thought that I would give you an update now I've done half the job. Removing cylinders #2 & #4 I found a relatively 'thick' oil film on the cylinder wall, particularly at the bottom. I inspected the rings and they looked fine and the markings were on the 'top side' as they should be.
I inspected the cylinder heads particularly in the ports and there was no sign of oil there.
My question is how much of an oil film should there be in the cylinders and should it 'pool' slightly at the bottom?
Hopefully I'll have time to look at the other 2 cylinders tomorrow.
Kevin