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Lugging the motor which increases side loading, contaminated oil especially with moisture which causes seal failure, pitting and bearing failure. Laying up the car for winter with contaminated oil giving it several months to degrade the bearing. Overheating the motor damaging the seals.
FWIW, my car has always been in Calif and had regular weekly use and <10k oil changes. The bearing came out while doing a clutch and was in remarkably good shape with both seals intact and no visible corrosion or slop. I do 4k oil changes now and expect the LN bearing to outlast the motor.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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