i am with joe_black on this one. find a new mechanic. there is no way you burned off 5.5 qt of oil (with no smoke). it leaked somewhere. and the crankcase would not fill up with pressure due to the pcv vavle stuck closed. there is another vent hose on the other valve cover with no pcv valve it would have vented there. the mechanic has no clue and is full of crap. get a new mechanic.if he cannot diagnose a problem then he sure doesn't know how to install an engine. shawn