OK no leak from oil cooler but very small leak into valley and I can't quite work out where it is coming from. No noticeable oil use but I like perfection if i can achieve. I think it my be rocker cover and am wondering if this is common , and more to the point how hard to correct.

I have changed out the oil cooler, preventative maintenance, also the turbo feed O rings , no leaks there.

I am after suggestions , in reality leak at present not bad enough to warrant a big job but if an easy fix I will do. M16 SVD8 ,4.4 HSE with a few extras, Sold R50 , Wife SQ5 , BMW R1200GSW.