The Service Rep told me they saw more M104's with head gasket problems than M103's. The job is done. The people who did it had essentially a blank check from me and did whatever they thought was necessary. They didn't find anything wrong with the head. Maybe it's because this engine has had Mobil 1 15W-50 in it since the 1,200 mile mark.

My wife and I both thought the car ran especially well after we got it back but that may be because we've been stuck driving a
Taurus for three days.

Since we're down to one car, it won't be sitting around so much anymore.