IMO, 10k oil change intervals are far too long especially concerning timing chain life. I suggest 5k or annual (whichever comes first) oil changes with filter to prevent timing chain stretch and piston oil ring clogging/coking.

Age will not hurt the timing chain mileage will; however, age will take its toll on timing chain tension rails/guides which can cause chain failure. Tension rails/guides should be replaced when they appear "beer bottle brown".

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