What could cause be of oil all over engine compartment - Checked dip stick and it's sealed. ????? help
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T25 Yamaha Engine Oil Leak
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The seal between the oil filter and the block could be leaking. Also, it is common to spill oil when removing a filter from some Yams. This oil migrates to the lower cowling.
Other places to check are the crankshaft seal at the top of the motor, the crankcase breather tube and the upper camshaft seal.
As Rodbolt noted, you can clean the engine thoroughly and then add flourescent dye to the oil. Then you shoot the block with an ultraviolet lamp and the leak will jump out at you.
Tracer Products Dye-Lite TP3090-0601 - Gasoline Engine Oil Dye | O'Reilly Auto Parts
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