There is a replaceable rubber seal in the oil cap. The dealer is supposed to replace it every oil change. The stock ones are around $0.40 and an almost lifetime one is available for $10 from IPD. Are you certain it is the Oil cap leaking from the seal or is the PCV system clogged?
http://www.ipdusa.com/products/5884/115315-ipd-hd-viton-oil-cap-seal
thanks chris,thats what im going to check next,someone else asked me the same question about the pcv valve. thanks for the link on the seal,i dont go to volvo so they make you buy the whole oil cap just for the seal,but i found a place to get all my parts.its a disassembly place. they have everything.www.autodisassemblyvolvo.com
Well glad to help, I would replace the oil cap seal anyway if it has not been done in a while.
An easy way to determine the PCV issue is to remove the oil dipstick with the engine running and see if mist is coming out then put your thumb over it and hold for 5 seconds or so then remove if pressure built up then you should probably clean or replace the PCV trap. Which I can guide you through if need be. I like to go the most inexpensive routes first.
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