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Higher mileage care have less of a chance of a failure. Change oil every 5K miles on daily drivers or every 6 months on a garage queen. Keep the oil level to the top of the stick.
The numbers I read said "10% of the 996 engine failures were IMS related" not 5 to 10% of all 996's.
I read somewhere that alot of the actual IMS failures had one thing in common, poor maintenance, low oil levels and filthy oil.
My opinion, take care of your car, don't drive it like you stole it, after all you didn't steal it and if it granades its on your dime and keep an eye on the dip stick. If the IMS bearing lost its inner seal and the ball bearings are exposed inside the engine it is crucial that the oil level is not low so the bearing get lubricated by the motor oil.
My 996 could pass for showroom brand new, I'd rate it a 9.9 out of 10 and it has 70+K miles. I drive it daily and only use Mobile 1 0w40. The car runs it's coolest with that grade, I've tried 5W40, 10W40 and 15W50, the temp gauge is cooking hot unless its 0W40.
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