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GL4 and GL5 gear oils are NOT the same; some OEM's spec GL4 because it is friendly with brass/bronze alloy yellow metal synchro rings used in their trans, a GL5 gear oil contains additives the chemically attack and can destroy those synchro's.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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