I have a 2012 Volvo S60. My engine light was on so I took it in to be serviced after scanning it (the code indicated PCV, idle air control, and RPM higher than expected). Although the oil was lower than usual, I did not notice any oil leaks prior to getting it serviced. I paid $700 and a few days after I got it back I noticed an oil leak...it was pretty bad. I'm wondering if the oil filter housing with PCV service could have caused an oil leak in some way? Thanks for your assistance!