How many miles before replacing the timing change
Replace the timing chain when you have timing issues caused by the chain. I had a '95 Sentra with more than 250 000 miles and never replaced the chain. Don't fix it if it's not broken ;)
I also have a '98 Sentra with 302,000 miles on it and haven't had a need to replace a timing chain. L-R is right "if it ain't broken don't fix it"
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