My 2008 Silverado's oil pan looked like a mud bog until I swapped the PCV valve
Pulled the pan on a customer's truck at my place in Tulsa and the sludge was a half inch thick, same truck that had clean oil three months back. Turns out the PCV valve was stuck shut so the crankcase was pushing blowby past every seal it could find. Anyone got a good way to flush that crud out without pulling the whole motor apart?