My 53 1.9DCI is coming up to 100k she was serviced regularly up to 72k when cam belt+water pump were done too.
Since then i've done usual servicing myself ie; brakes,(headlight bulbs grrrrr) oil change, fluids, filters etc.
Now i'm wondering should i be popping the car in to a garage for checks on things i'm not to hot on like injectors, valves, throttle body, bits inside the engine that i know nothing about?
Bearing in mind (and i say this touching a large piece of wood) she is running fine and appears to have no problems.
Or do i listen to the old saying if she aint broke don't fix it.

I look forward to all comments and advice.
Nick.