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Typically how long does an OEM chain last? I'm at just under 13k miles and I think my chain has reached the end of it's life. I have a tight spot in the chain and even if I adjust it at the tightest spot I get too much play in certain spots and too tight in others. I also measured out 21 pins per the service manual and it's just over the limit it's allowed to stretch. Supposed to be no more than 31.94 cm and I measured 32 cm.
Is it just me or is 13k miles a bit on the low side? The only changes I made to the driveline recently (about 500 miles ago) is I added a -1 Driven sprocket in the same stock pitch (525). Do you think by adding a new front sprocket to an old chain I've worn it out sooner?