Why is oil coming from air cleaner on 2008 Harley?

Oil coming from the air cleaner on a 2008 Harley can indicate several issues, primarily related to the engine's breather system. A common reason is excessive crankcase pressure, which can force oil vapor into the air cleaner. This may be due to worn piston rings, valve seals, or a clogged breather system. Additionally, overfilling the engine oil can also contribute to oil leaking into the air cleaner.