- Petaluma, CA
I strip off all oils and use dry ceramic lube that does not attract grit.I'm a mechanical engineer. I would say, as a rule of thumb, clean the chain now and then. I take it off the wheel and let it dangle into a tub of petrol and swish it about to flush debris out and away, then put it back and use an engine oil. It's just common sense, grit will create a grinding paste. The time to change it will be when the cog shows significant 'hooking' wear, easy to spot, and so then change both the cogs and chain.