The final production year for the 996 before the 997 arrived. These late models, including the desirable C4S and Anniversary editions, are now appreciated as the swansong of the first water-cooled era.
Early M96 engines can suffer intermediate shaft bearing failure, leading to major internal damage.
Metal debris in oil filter, Oil leak near rear main seal area, Sudden catastrophic engine failure
Later 3.6 engines can suffer bore wear, leading to ticking, smoke and expensive rebuilds.
Ticking from one bank when warm, High oil use, Sooty exhaust on one side
The rear main seal between engine and gearbox degrades over time, causing oil to leak into the bellhousing area. Often mistaken for IMS failure.
Oil drip under car when parked, Oil residue between engine and gearbox, Burning oil smell
The coolant crossover pipes and thermostat housing o-rings perish, causing coolant loss and potential overheating. Plastic degrades with heat cycles.
Sweet coolant smell, Low coolant warning, Coolant dripping under car