semi synth.

[zipps]

did oil change on sporty last week with semi synth.and now have fine oil mist from after market rocker box breather.removed filter last night expecting to find it oil loged but was quite clean.I know that the little plastic valves can play up after a while but have not yet done 5.ooo .so i am thinking will go back to mineral .as was ok before.Will systm have to be drained fully to change back.....thanks..

[Alan B]

Drained and flushed I would think. Can't see them mixing well together. Personally I've never had a problem with the HD oil apart from price, but I use that little it's not worth worrying about. If it's not broke don't fix it.
Alan B

[Phil]

Bet you over filled it, type of oil makes no difference.

[zipps]

Yea could be over filled i will leave it a bit and see what happens..