Oil filter

[Katana2]

My 2cents worth. Replace coolant. Dent in filter will not restrict in and out flow of it, no prob. If oil has friction modifiers in it, will build up gunk on clutch plates and stuff em. Should notice that before temp prob! Not worry about temp gauge problem unless there starts to be a running problem. Thermo will do enough to care for the motor when stationery?, then don't frett. If motor starts to run (idle) poorly when temp gauge is high?, shut down, self medicate and seek professional help.