You can pretty much count on that the only oil in a vehicle that has been changed is the engine oil. I never hear someone say that they changed the P/S fluid, tranny fluid, transfer case oil, axle oil, etc. Hell I think people with manual trannys change their oil more often than people with autos. I know two things that detour them away. 1. The crazy price mechanics charge. 2. "Eh, you don't need to change it."
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