The "W" stands for weight. The "W" stands for winter. 5w30 is a multi viscosity oil. It acts like both 30 weight in warm weather, and 5 weight oil in cold weather.
Winter or cold temperatures.
If you mean W as in 10W30 motor oil, it stands for Winter. The thickness of those oil changes with the temperature- they are not as thick (viscous) in cold weather, but get thicker as they warm up. Makes it easier to start the engine in cold weather.
Winter
Should probably use 10 w 30 or 30 w.
The W in 10W-30 (example) stands for Winter.
5 w 30
5 w 30
Yes, you can use 10 W 30 motor oil in a 2003 Mazda Protege. If you live in areas where the temps are very cold, 5 W 30 is recommended.
10W-30 motor oil is recommended for the 2005 BMW X5 automobile. When the automobile is being used in extremely hot climates 10 W 40 motor oil is recommended.
5 w 30
5 w 20
Motor oil are of different grades. density of each one will be different and hence the weight may vary accordingly.weight of 20 w 30will be lesser than that of 20 w 40