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There is no maintenance point for replacing the chain. If you are concerned about it, what needs to be done is the engine is inspected for the amount of chain stretch it has. There is a maximum allowable amount, I think it is measured in degrees of rotation variation from nominal, 3 or 5 degrees come to mind.
On the pinging, try premium and see if it goes away. You can still use regular in that case (I wouldn't) but don't push the engine to the pinging point if you can avoid it. It's not caused by the unleaded, just the low octane.
Gilly
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