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1990 Cruisers Inc. Volvo Penta barnagat 2530 570A/PS AQ290/DP with 700 hours. I put a new belt on V pulley, but still slips and squeals. Pump decal indicates to use 10w 30 motor oil, but had power steering fluid from previous owner. I drained and put 10w 30 oil back in system with no change...