Oh boy, I'm laughing now. My car went in on Jan. 6, and I get it back tomorrow. I also had a small "knocking' sound. Turned out to be a wrist pin on a piston. THAT was last summer; car down from may until august. The 'ace' mechanic, actually trained by Mercedes, really did not know how to work on these engines. This time, it was also the wrist pin but dont now which one. The complete engine is $27,000. A short block is $10,000. Chrysler would not pay for a whole new engine, but did supply the short block. Well after all these weeks, you might ask, what took so long?. When you have a small dealer with only one mechanic knowing these cars, their time is spent elsewhere, as in other warranty work. Did you know there are so many bolts that cant be used over again in a rebuild. That's right, use it once, throw it away. I know times have changed, but I rebuilt many a small block american engine, and the bolts held just fine. I guess my rant is this. These cars are good, but if you dont have a warranty, watch out. After these are out of warranty, a small shop is all that will take them. Mine is all under warranty thank god. These "one off" mechanics who might know the car still dont know what to do because so few have been rebuilt. Thats scary. I'll have a new engine now. Can anyone show me how to drive this car since its been a longgggggggg time since the last drive.