Good day, all. I discovered this site googling ‘oldest cambelt’ and your 2011 thread came up. I have been pilloried on a UK site for my contention that a modern quality cambelt should last the life of the engine as long as something it drives doesn’t seize. I have practised what I preached; our 10yr old VW Passat 2.0GL belt was still going strong after 242,000m when sold, although I did have to replace a whining stiff tension pulley at around 130,000m before it seized and fried the belt. This was easy but replacing the belt was beyond my ability so I left well alone as it looked and felt OK. My 15yr old Audi A6 2.8 belt still looked good at 133,000m when I sold it. Our old Passat GL5 estate belt only got changed at 130,000ish because the water pump needed replacing and it would have been foolish not to, although it also looked fine. Our current runabout, a 2000 Ford Focus, has its original belt at 112,000m. Admittedly our UK climate is benign (I see this is a USA site) so our belts are not subjected to your frequent subzero to v hot stresses. I have no idea what effect this might have on the ‘bell curve’ of expected belt life.
I would have liked to have added this comment to your 2011 thread ‘Oldest timing belt’ but the ‘discussion is closed’. I wonder if this topic will produce any updates?