Today, at 231,668 (approx.) on odometer I changed the differential oil to Amsoil Severe Gear 75w90. The old oil was noticeably thicker when cold than the Amsoil was, and I have no idea what the old oil was. No issues driving on this gear oil 50+ miles today. I should see some improvement.
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Last edited by 101Volts; 03-07-2016 at 08:22 PM..
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