In Reply to: Who uses synthetic oil? Info needed posted by Darren M on February 28, 2001 at 09:04:07:
I believe Semi Synthetic is better because Synthetic is too thin. it is okay for newer performance cars but not so for the E30 M3.
Its something to do with the tension of the chains. I'll mail you 2morrow exactly why cos I have forgotten but have it noted down at home.