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I figured equivalent wear must depend on engine load and RPMs to some degree, so for my relatively small and light van with tall gearing, I let it go to around 160,000 miles — don’t recall exactly.
I did keep close eye on fuel economy to see if there was any decline, and on emissions reports generated during state inspections. And also subjective performance. There was no noticeable decline.
I put it off because it’s expensive (could not do it myself at the time), plus I wasn’t sure I was keeping van. While I could have waited longer, I went ahead and had them replaced.
If the same V10 was in a motorhome weighing twice as much as my van, and getting half the mileage, I would have done it much sooner.
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