I have an 05 Volvo s60 2.5t and I was replacing the pcv breather because a month ago I had some hard knocking things weren't firing as they should be and I changed the ignition coils and spark plugs. There was oil in the chamber but I read that the cause of the problem was most likely the pcv breather. So while changing that out I was finding some yellow fluid in hoses and the breather. Anyone know what this is and what do I need to replace to fix it? Thank you in advance.