I switched to mobil 1 0w40 on both our mk1 and mk2. Not sure its
any better or worse than other options, but it is definate that the mk1
which used to suffer HLA clatter if left for a week or so no longer
does, so in my mind at least there is some benefit. Have had no issues
with oil leaks or others horrors that you are supposed to suffer when
using fully sythetic, so I will continue to use it…
5w50, but as he says ^^^^^^^^^—