I purchased a Richmond Powertrax no-slip posi for my 2000 model (non-posi) S10. Richmond instructions state I had to use only the Richmond 75w-140w synthetic diff fluid. I can find different brands of 75w-140w synthetic diff fluid so much cheaper at any auto parts stores, plus I would not have to pay $29 a quart, plus $18 in shipping and wait a week. Are they forcing you to buy only their fluid or would it be acceptable to use any 75w-140w synthetic diff fluid?
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