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How often should the oil in the rear differential be replaced in a 2016 Holden Captiva? Also if a scan tool has been used to scan for faults, and found the rear differential clutch not engaging properly and sticking intermittently, could just the clutch be replaced or do I need a complete new differential?
Holden’s own service schedule for this model Captiva doesn’t specify a change interval for the differential oil. Instead, it recommends the oil be changed when required according to how the car is behaving. Which would suggest that your car is, indeed, ready for new differential oil.
As far as the scan goes, be sure not to confuse a sticking or non-engaging rear differential with the same behaviour from the centre differential. These are both technically differentials, but have vastly different roles to play. In the case of an electronically operated differential, the clutches can sometimes be replaced separately, but in any case, you need to go deep inside the differential, so while your mechanic is in there, have them check out the whole unit.
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