Without knowing what brand or model pressure washer you have, as a general rule:
If you're talking about the gas motor, it usually takes 10W-30, 5W-30 or 10W-40 motor oil, depending on the temperature range in your area. 10W-30 is a good all around oil to use.
If you're talking about the water pump, if it's an oil bath pump, use a straight 30 weight, non-detergent motor oil.
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