05wt
05wt refers to a specific designation within the SAE (Society of Automotive Engineers) viscosity grading system for engine oils. The "05" in this designation represents the oil's viscosity at low temperatures, specifically its cold-cranking viscosity. A lower number indicates a thinner oil at cold temperatures, which allows for easier engine starting and better oil flow during cold weather. The "wt" part of the designation, while not a standard part of the SAE grading, often appears in specific product names or internal company codes to denote a particular viscosity grade, likely emphasizing its "winter" (cold weather) performance.
SAE 0W-20 is a common example of a low-viscosity oil that would fall under this type of