Copied from another 3.6 engine failure thread originally posted by myself:
A customer had his 3.6 passat towed in because it was running rough and the engine light was flashing. Turns out the timing gear bolt backed out just enough to allow the gear to wobble and shear off 4 teeth. The tech replaced all timing gears, chains, tensioners, and hardware at the QTM's recommendation. So the tech replaces everything and takes it out for a test drive. After coming back from a 20 mile test drive, the the parks the car and notices a *little* smoke coming from under the hood. He pops the hood and the rear of the engine has just caught fire. Apparently the bolt backed out again, cut a hole in the timing cover and the gears and chain were flinging the oil (in a fine mist) right onto the left catalytic convertor.
Needless to say the engine was replaced with a new engine.
Ohh Yeah, Did I mention the car had only 4400 miles on it?
Here is the VIN and date of production of the vehicle that had the engine replaced at my dealership at 4400 miles
With a production date of 07/14/2006