14-05-13, 07:28 PM
Strange. I'm currently on an OE chain and sprockets (with Scottoiler) and don't have noticeable rust on the chain now they've stopped salting the roads. You don't happen to be making frequent visits to the coast, do you?
Either way, I certainly wouldn't change it unless it was necessary… i.e. worn, damaged or with seized links or rollers.
A quick way to check for wear is simply to try pulling the chain away from the back of the rear sprocket, if you can move it 3mm or more then the chain is worn ("stretched") enough to be regarded as knackered.
As for the chain guide: mine is still serviceable after 150k.