The "W" indicates winter performance (low temperature flow), while the number after the dash indicates high-temperature viscosity. Always ensure the pump has cooled down before beginning the draining process, but avoid working on a completely frozen system if possible.
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Without proper lubrication, the plungers and seals would wear down within minutes of operation. The Maintenance Schedule Even the highest quality oil does not last forever.
Deciphering Viscosity Ratings Viscosity, measured in units like SAE (Society of Automotive Engineers) or ISO (International Organization for Standardization), refers to the oil's thickness. Contaminants such as metal shavings from normal wear, silica from the aggregate in the water, and moisture degrade the oil over time.
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Unlike standard machinery, pressure washer pumps operate at extreme pressures and temperatures, placing immense stress on the lubricant. Most modern high-pressure pumps are designed to use a 20W-50 synthetic gear oil.
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