why do I have oil coming through into the air filter?

Make sure the oil level is right and replace the PCV valve for the correct one. I tell you a secret: The local Jiffy Lubes creates very good revenue for us. We never had to replace so many oil pans, filter housings, PCV valves, seals, catalytic converters before they opened their locations around us. People still want to get cheap oil changes - it cost them 10-20X more at the end. We love JL, I wish there would be a lot more around us ; ) Zee