![]() So, that means when you are comparing 5w30 vs. The five and 10 digits refer to the viscosity at cooler temperatures. What’s vitally important, is that you stick with what the manufacturer recommends for oil viscosity. Viscosity will determine how your engine’s oil will deal with changes in temperature, pressure, and speed. A thinner oil reaches the engine parts quicker, and circulates faster, while a thicker oil tends to adhere more easily to the engine parts, and will provide better lubrication when engine tolerances have deteriorated, or in severe-duty applications like racing or off-road engines. More recent engines have been built with better technology, and much more strict tolerances, which also means a much thinner oil is necessary to properly lube the engine’s bearings, and circulate quicker and freer throughout the engine, and often times with less overall oil in the system. Older engines were built with much looser tolerances, which allowed oils such as 10W30 to be commonplace as an OE recommended oil in the 1990’s and before. Where this is vitally important is in an engine’s bearing clearances. A higher oil viscosity number indicates a thicker oil. The term “viscosity” refers to the thickness of the oil and its resistance to flow. ![]()
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