Use 20w40 SF or SG motor oil in the gear box, 20w50 in hot states like Texas. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell. Without filter change it takes 3.1 quarts. With filter change it takes 3.3 quarts.
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