Porsche 911 GT3R 2010, Technical Manual

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5.6.6. Gearbox maintenance
The following work should be carried out regularly:
 Check gear ratio teeth, dogs and dog-rings
 Check the shift collars
 Check the gear hub and gear roller bearings for signs of wear
and pitting
 Check the oil for signs of metallic debris
The following work should be carried out after a total running time of
approximately 30 hours:
 Check the crown wheel and pinion for pitting
 Replace the pinion bearing ( 4-point bearing)
 Replace the oil filter
 Replace the shift cable
 Replace differential housing