When you changed the oil "recently before these issues occured", what oil did you put in it? I'm with amx and it's most unfortunate that you have your car at the dealer; only o.k. if it could be fixed under your powertrain warranty(extremely unlikely). Don't go buying parts just because the dealer says that's what's needed, because it's a very real possibility that they're full of ****, and just wanting to throw parts at it. Give the Forum members a crack at it before you go wasting money. Also, it would be good for you to get an inexpensive code reader.