No, multi-viscosity oil does not get thicker when it's hot; rather, it becomes thinner. Multi-viscosity oils are designed to maintain their effectiveness over a range of temperatures. For example, a 10W-30 oil has a lower viscosity when cold (10W) and a higher viscosity when warm (30), allowing it to perform well in both cold and hot conditions. Thus, while the oil's viscosity changes with temperature, it is formulated to ensure optimal lubrication in various environments.
10w40 is thicker (but only when hot, they are the same thickness cold.)
That means the oil is 15 weight when cold and 40 weight when hot. The higher the number the thicker the oil.
In cooler temperatures it's ok, but in hot weather run a thicker oil.
40 is thicker. 20w 40 means its 40 weight at normal and hot temps and 20 weight at winter temperatures. 40 stays 40 at all times.
20W50 is the " thicker " oil
5W-30 is when it's hot. They are the same when both are cold.
The higher the number the thicker the oil.
Engine oil does not get "thicker" at high temperatures it gets thinner.
when oil gets hot the particles break down that means it thins out when cold they bunch together making it weigh more or thicker
10w30 is thicker than 5w20
25 to 30 lbs hot idleing if it is under 10 you got problems running thicker oil will raise oil presure like 20w50 or sae 50woil.
Oil is thicker than water because oil has larger molecules that are more tightly packed together compared to water. This makes oil more viscous and resistant to flow compared to water.