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This happened just few days ago with my 2005 997 C2S which has been well serviced with only 44,000km mileage. While I was driving in town at speed of about 34-40km/hr, after I turned at the corner, there was traffic in front, so I slowed down and just before the car stopped, all the lights on the dash came on and the car stalled, then I tried to start again which it did but immediately stalled again and from there it felt like the battery was flat as I could only hear click sound and starter motor was not turning. I then called the tow truck company (lucky nearby), from there the horrible thing that I saw from the back of the car really scared me, the road was full of engine oil from the back of the car.
The car was then towed back to my mechanic and over the last few days, they have taken out the engine and realized that the IMS bearing has been completely broken into pieces BUT quite luckily according to my mechanic I was driving slow, otherwise the engine could have been completely damage without much he can do. My concern is according to various forum posts, IMS bearing failure usually have signs such as engine oil dripping in carpark which it didn’t occur in my case. The car was running well without any unusual noise. Has this kind of things been happened to anyone before?
Now, my mechanic said as the rebuild cost will be very high, he suggest me to just replace the bearing, take off the oil sump to make sure no broken metal being left in the engine, I can avoid an expensive bill. Further to my case, I do suggest to have your IMS bearing check specially while you have your gearbox off the car.