Does any body know if the rear differential (for 4WD) is really needed very time you have an engine oil change?
I sent my MDX last weekend to the dealer for the first oil change (@4200 miles) and they suggested changing the rear differential oil. I didn't have them change it because the cost was $87.99 +tax.
I checked in the manual and it mentions that the engine oil and rear differential oil needs to be changed every 7500 miles.
First of all, does the oil need to be changed or just check its level?