Thanks, I'll try the google thing, plus I found the right posts mentioned up above so I should be good. I knew it was something to do with Crankcase Ventilation but couldn't figure out the first C

Thanks for that.
I'm debating between doing the mod and just putting a new Oil Separator on it. Will putting the new oil separator on it resolve most of the issue or do I really need the mod to resolve it to a higher degree?