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That's an A/C line and the cap covers the schroeder (sp) valve where the pressures are checked and the refrigerant is serviced.
What is leaking is compressor oil. Is it an on-going leak, or could you perhaps clean it and it stay dry?
If it is truly leaking you will need to have a shop drain the refrigerant, replace the stem in the valve and re-charge the A/C.
Most likely, the oil was just left as excess that spurted out when someone last tested, or serviced the refrigerant charge. Clean it off and check back later... It is ok to remove the plastic cap. Nothing should come out. If it hisses, or bubbles when you remove the cap, put it back right away and have the valve stem replaced...
Good luck! Hopefully some mechanic just left a mess...
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