i took my truck for engine oil change,my service advisor told me that i need to replace my differential oil,he had me changing it when the truck had 7000 miles,he told that my differential service is overdue and i need to replace the differential oil every 15000 miles.i don't trust him.the truck is mainly front weel drive ,the vtm4 power the rear weel only when needed.Does anyone know the maintenance interval for the differential?
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