Correct answer
When specified by the manufacturer’s maintenance schedule.
Follow the manufacturer’s maintenance schedule for that vehicle and its conditions of use. Replacement may coincide with an oil change, but do not replace the stated interval with a universal thousand-kilometre rule or a decision independent of that schedule. Used filters and oil must be handled as waste at an authorised collection facility, without spilling onto the ground or down drains.
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Always every thousand kilometres, even if the manufacturer specifies otherwise.
When specified by the manufacturer’s maintenance schedule.
Only when I decide to change the oil, without consulting the manufacturer’s schedule.
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