I have an ~4 year old Murray push mower with a B&S 500 Series engine. Model 9P602 0019 F1. After the last mow, I noticed some oil dripping from under the air breather, but did not think anything of it. My next mow I looked down and there was a patch of brown sludge under the air breather. The inside of the breather tube was oily. What could be causing the oil to come out the air breather? I've cleaned up the breather tube and carb up a bit, but haven't tackled any further diagnosis.
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