• In this case, viscosity. Engine oil consists of various weight mineral or synthetic oils combined with additives for engine protection. Oils may come in single or multi-grades and meet various oil performance standards. Multi-grade oils usually start out as single-grade base oils, such as SAE 10W (Society of Automotive Engineers is a large standard-setting organization for the automotive industry). Then viscosity-index improvers are added to modify viscosity. The end result is an SAE 10W-30 oil capable of flowing like a 10W oil at cold temperatures and a 30W oil at higher temperatures. A viscosity index is an arbitrary number assigned as a measure of the constancy of the viscosity of a lubricating oil with change of temperature with higher numbers indicating viscosities that change little with temperature.
  • There's not a lot of difference. The 10w/50 might enable you to start the engine a little easier in an extremely cold climate.
  • not sure

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