Throughout the years owning cars, whenever I do my cars' maintenance at the workshops, I think 9 out of 10 workshops would advise me, if it ain't broke, don't fix it!

Recently, my car's mileage has reached 150k km, checked with the mechanic the cost to replace water pump, fuel pump, engine mounting, motor and etc. Both mechanics told me the same thing.

I tried to search, but none give me a very satisfied answers on what mileage to change which part as part of the preventive measures. I have checked car manual, it doesn't mention clearly at which mileage which parts to be changed. Understood that a lot of parts are relying on our driving skills and style. I am not considered myself as a car man, but last I changed all my stock tyres clocked at 90k km! (Which these stock tyres have no problem stretch to over 100k km as the indicators show still safe).

We all know that wear and tear thing can't be avoided. The purpose that I carry out preventive maintenance is to avoid car break down out of sudden and maintain good driving pleasure (imagine a leaking cooling coil will cause the journey inside car cabin so stuffy) and tip top condition close to new car if possible. 

I would like to list down few common fluids/ items to be changed (advisable):

Fluid:
Engine oil 5k to 10k
Oil filter 5k to 10k
ATF oil 30k
Break fluid (50k?) < dahek is this
Coolant (40-80k)
Air-con coolant (80k?)

Wear and tear:
Battery, Amaron (have it checked annually or show signs of low power, 2-3 years should be)
Air filter (used at own's risk, K&N, slightly dirtier throttle)
Cabin filter (50k?)
Spark plugs (Mine 100k)
Engine mounting (100k?)
Engine hoses (?)
Radiator hoses (?)
Tyre (~80-90k for me, light footed) < sounds abit sketchy if you ask me.... do you drive a truck?
Break pad (~120k km for me, don't use break so much, some 20-30k don't know how) < you telling me you dont brake much..... really......
Break disc/ break drum (every 30-50k?) < WTH.... you change your disks more often than your pads!?!? something is WRONG with your car
Engine timing chain/ belt (?)
Air-con belt (?)

Parts:
Shock absorber (Around 120k)
Radiator Fan Motor (Around 150k?)
Air con compressor (?)
Air con cooling coil (150k)
Water pump (150k?)
Fuel pump (150k?)
Alternator (150-200k?)
Starter (?)
Light bulbs (periodically checking, ~70-80k) < really?
CV joints
Periodically
Overhaul (?) < really up to you.... friend has his rebuilt every few k.....  (i know it gets pulled apart very often, less than 5k, but not always an overhaul)
Fuel tank (?)

Understand that it all comes down to driving habits, conditions and fluids/parts used. I always opt for close to original parts (OEM, seldom able to get "genuine original" parts).