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Might have been some residual oil from the oil filter area. It can splash onto the side of the engine when removing the filter canister and maybe it dripped down / off and was done.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
1987 928 S4 - Granite Green Metallic (Felsengrun)
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