Dear Greg,

Hope you're well. Has the oil breather box been replaced? I recall a post, a few months ago, in which it was pointed out that the breather box's internal passages can get clogged to the point, where cleaning solvents are unlikely to be effective. It may simply be easier to replace the unit.

If the crankcase ventilation system is clogged, excess pressure could force oil past seals, gaskets, etc.

Hope this helps.

Yours faithfully,

Spook