I normally commute 75-100 km (50-60 miles) per week. I'm considering whether I should plan to disassemble my center bracket, clean and re-lubricate it as a preventative measure, or whether I should just ride until it starts to make noises. It's a cartridge type, 3 piece. As a child we would ride our bikes forever and I can't remember ever having reason to pull my cranks apart, except if I got a bike second hand which needed restoration. I've got all the latest tools and know how, so that's not the issue. But I'm not as enthusiastic as I used to be, so don't want to be doing excessive maintenance.
Opinions welcome......... ;-)