I'm still watching this thread with interest-any update? When my 16v had the tensioner replaced, I lost about a .5 bar of oil pressure at idle if i use the thin stuff. I attributed this to the tensioner itself (and therefore the oil circuit) being different than the original. I have nothing to base that on as I don't know the path the oil takes. IIRC, I read about another person who lost a .5bar or so of pressure in the same way I did.