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If you use the hydraulics a lot, 10W/30 STOU (Standard Tractor Oil Universal, suitable for engine, hydraulics and gearlube) or 10w/30 UTTO (Universal Tractor Transaxle oil, a bit cheaper than STOU, for hydraulics and gearlube) are better oils because they are more stabile under pressure and do not tend to foam as much when hydraulic return spouts back into the sump.