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The evil rust!
It's confined to the inside of that single piece of metal on the exhaust pipe. I'm not really worried about it though.

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The chain began to get rusty after several months of me washing the bike numerous times and riding over 300km in rain without being oiled once. I've oiled it a few times since I began to take note of the rust.
I need some expert advice: Should I replace the chain or will it be ok if I just keep on oiling it?