PHZI, I suspect the 996 and up till 997.2 of Porsches water cooled 911 variants gained a bit of a rep for engine issues of a sort that the older air-cooled seemed not to suffer and which to the best of my knowledge were perhaps not really blamed on either the choice of lubricants or indeed the frequency of oil changes, though happy as ever to be better educated..

I think that flat engines may be more prone to exhibit bore scoring issues than vertical or V engine configurations...?

I think you may find that 2 year oil change intervals on 911 variants may still be the case, and certainly was the case up to at least 991.1 in 2012...

Griffo, still keen on MGB`s Midgets and others of that era, which made learning to weld and much else an absolute necessity...As for restoration, I posted some pics in the gallery of my MGB restoration attempts too, though unfortunately I no longer have gallery access due to my own digital dilemmas..!!!