Hey guys, so I purchased a scag 48" turf runner with a 22hp Kohler. The issue is,....decent oil pressure at start up but slowly drops and by 15-20 minutes of mowing it's down to almost nothing, the reason I can see this is the previous owner replaced the hour meter with a oil pressure gauge. Second,after mowing for 15-20 there's lots of black oil underneath engine. Clean oil checks full at dip stick. I'm at a lose, head gasket time? Or just a main seal? No clue. Thanks. Dave
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