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But I suppose it really is 60.
I agree the timing belt interval is a bit conservative if the seals have held the oil off of it.
So far those belts I've changed which I originally installed have held to 100K. Most recent maintenance replacement I made was at 104K. Those I've replaced because they failed were belts which came with the car, and were exposed to cam seal and crank seal leaks.
Of course my experience only represents 15 years, 11 240's, and roughly 600K miles among them. Just anecdotal. We keep them until they are taken by deer, t-bone, raging floodwaters, or salt.
I think synthetic oil helps in that marginally missed oil change intervals don't subject the cam to increased friction. I pull the cover and examine the back of the belt for the micro cracks that make it just distinguishable from the belt in the new box. Never saw one with teeth missing and still timing the engine, so I wouldn't use that criterion.
Summing up, keeping the friction down at the cam, with good oil maintenance, and keeping that oil off of the timing belt should make them last a lot longer than the guessed-at suggested replacement interval. A classic case of YMMV.
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Art Benstein near Baltimore
What's the definition of a will? It's a dead giveaway.
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