60,000 tune up

Just noticed that in the FSM for the 6G75 it says replace timing belt at every 168,000km or 105k miles when it has not been replaced originally at 60k . Not sure why that would be, doesn't make much sense. Anyways the 6G7X series engines should have tune ups every 60k.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth