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'99 996s were afflicted with an engine casting porosity problem, how many is, unfortunately, only known by Porsche. The problem allowed cylinders to fill with coolant, putting that engine in a state of hydraulic lock. Engine replacement followed. Anyone interested in purchasing a '99 996 should definitely access the available dealer warranty data base to check if the car (by VIN) that they're considering for purchase has had the engine replaced. Will a car with a replaced engine be less risk than an original? Only time will tell. '99s also had oil leaks; crankshaft seals at the flywheel and leaky intermediate shaft covers behind the flywheel were the two biggest offenders. They're fixable, but trans removal is required. In addition, check the records to see if the coolant reservoir was replaced, and don't forget, you're looking at a 1st year model. Historically that didn't bode well for Porsche 911s.
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Keep the Shiny Side UP!
Pete Z.
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