Accidentally added synthetic. Now what?

[RyanM]

Yeah - the problem was that the phosphorous was clogging up the cat matrices, but it's the zinc that acts as the anti-scuff. However, to reduce the phosphorous content, they've been reducing zinc in tandem (haven't come up with a way to replace the zinc in the oil.)

But, they keep cutting it because the EPA is crawling up their collective arse over catalyst failure...

Well said.

Moly and Boron is supposed help keep a film better and attract to the zinc that is there, each rev. the cam makes, each contact.