I think I figured out finally where my oil leak is. Last time they said it was the oil filter cap. Reading another post here about a rear main leak, mine is leaking from about the same spot. My clutch has also started to "chatter" or vibrate really badly when I first start the car and the first few engagements. My question is this..... It's certified, so they will cover the repairs to the rear main....should they also cover the clutch? If not, should I have the clutch done right away if they're willing to do it for parts?