Question: 20 50 oil what does it mean?
Answer: 09 What do those "20W50" numbers mean for my engine oil? ... 20W means that this oil behaves exactly like a 20 weight oil at 0F, and behaves like a thicker 50 weight oil at 210F. This type of oil is called a multi-viscosity oil because it is capable. of lubricating your engine under a wide range of temperature conditions.