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Whenever it gets dirty.
every 3000 miles
5000-7500 miles
Change it according to the manufactures recommendations as listed in your owners manual.
You should inspect the pads and rotors at least twicw a year and change pads if they are worn down to 2mm.
if your car's belt has bits of fabric coming out
Every 15,000 miles.
Every other oil change, drain water valve once a month.
Partner 1.9D 1993 to 1998. Recommended change intervals are. 72,000 miles under normal conditions. 60,000 miles under adverse conditions
I would say at least once every 3-4 months.
I change my oil in a 7.3 power stroke every 3000 miles no motor problems 240,000 on motor
Every 4000 miles. Change it when oil is changed, along with oil filters