what is the difference and why does it matter for cars to fill up on the different types of motor oil

You know the ones like 5W20, 5W30, 10W30, 10W40, 15W40, 20W50

what is the difference and why does it matter for cars to fill up on the different types of motor oil

You know the ones like 5W20, 5W30, 10W30, 10W40, 15W40, 20W50

oil gets thicker in cold weather, and thinner in warm weather.

you want a lower weight oil for the winter, but a higher weight for the summer.

5W means it is a 5 weight, and the W stands for winter, and the 20 is the warm weight.

The oil has different waxes in it to make it have literally 2 different weights.