It appears to me the tiny hole in rubber plug may be plugged! This is the vent for the oil cap. I have 2 class 8 trucks, and you have to clean the hole with a paper clip once in awhile. If the "seal" is bad on front of cap, oil would be leaking between the ring w/6 screws and the face of the actual cap. If the rubber plug gets hard from age, replace with new soft one.
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Rod & DeeDee Wise
04 Everest 343L, 07 Chevy 3500 SRW,4x4,D/A,ext.cab
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