Based on the manuals of our cars... usually every 40K (this is what i follow). Kung nababaha lagi yung car and is driven under extreme condtions... pwede earlier.
roydok,
Brake and clutch fluid should be replaced every 2 yrs regardless of kms travelled since this fluid absorbs moisture, which can cause rusting and leaks on brake/clutch cylinders.
PSF can be replaced every 40k km but if used often on rough terrain then change at 20k km. Better yet, switch to synth ATF and leave it for 50k km+.
if i want to change the brake, power steering and transmission fluids, can it be done in a normal gas station? mahal kasi pag sa casa mo pa ibabalik e. i figured i can just bring the fluids and have them replaced sa shop or gas station.