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How much maintenance?

Everytime I get my biked serviced, it ends up costing me over one hundred pounds (including parts), which is not much less than what I originally paid for it (it's a second hand Marin Muirwoods). However, everytime I get it back it feels radically transformed.

I accept that parts are going wear out and I will need to get it serviced from time to time, but I would like to increase the time between services, and keep the bike running well for longer.

All I have ever done myself is spray a little oil once in a while. What basic steps can I learn to do myself in order to keep it in good condition?

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