4) Infer why drivers living in very cold climates might use a different type of motor oil in the winter compared to drivers living in tropical climates.

## Step 1<br />The viscosity of a fluid is a measure of its resistance to flow. In the context of motor oil, viscosity is a measure of how thick or thin the oil is. <br /><br />## Step 2<br />In cold climates, the temperature drops significantly, which can cause the oil to become too thick or viscous to flow properly. This can lead to poor lubrication of the engine parts, which can cause wear and tear on the engine.<br /><br />## Step 3<br />To prevent this, drivers in cold climates use a different type of motor oil that is thinner or less viscous. This type of oil flows more easily in cold temperatures, providing better lubrication and reducing wear and tear on the engine.<br /><br />## Step 4<br />On the other hand, in tropical climates where temperatures are consistently high, the oil tends to become too thin or less viscous. This can lead to the oil not providing sufficient lubrication, which can cause the engine to overheat.<br /><br />## Step 5<br />To prevent this, drivers in tropical climates use a different type of motor oil that is thicker or more viscous. This type of oil provides better lubrication and helps to keep the engine cool.