Thinner weight oil flows more easily that thicker oil. Most new cars today use SAE 0w-20 or SAE 5w-20 weight oil. This weight will protect you in all temperatures. If however you drive an older car that uses SAE 10w-30 or SAE 10w-40 weight oil then you might want to use a slightly lower weight oil in extreme cold.
Because - with colder winter temperatures, a thinner oil will flow more easily.
Thinner.
in the winter months i found in any vehicle to use 5w-30 in the winter months being that it;s a thinner oil and run 10 w-40 in the summer being that it's thicker, cuz the thicker the oil is the longer it takes to warm up and start flowing than thinner oil does during the winter months, i made the mistake by putting the thicker oil in my truck during the winter when it really gets cold and it didnt want to start at all, i had to use a forced heater to unthaw it..
Low viscosity oil flows easier when it is cold but become thinner when it is hot.
In the summer 10w-30 in the winter time 5w-30. Use thicker oil in the warm, and thinner in the winter so the oil can reach the top of the head quicker in turn warming the engine faster.
The oil will appear thinner than usual. Do not mistake this for oil that is thinner at higher temperatures. Also, it should have a different smell than regular oil.
Winter 5w30. Summer 10w30.Winter 5w30. Summer 10w30.
I use 5w-30 in mine. valvaline. depending on what time of the year it is though (winter or summer) you'll want to use a thicker or thinner oil. sometimes in the summer if the oil is too thin, it triggers the engine oil light to come on. if u use too thick of an oil in the winter, you'll have trouble starting it. if been dealing with this for a couple years now. i bought mine in 07. hope this helps.
Just use a 5w20 oil all the time. Use a thinner oil in winter if you live in a cold climate, but a 5w20 oil can be used in most all situations. In extreme cold, a thinner oil will travel up to the valve train way sooner, thus protecting your engine.
10W40 is a thinner oil, and would allow the engine to run more freely, and although both are suitable for winter usage, a thinner oil will usually help the engine start more easily in cold weather.
Use exactly what your owners manual recommends. That is more than likely SAE 10w30 which works well in all seasons.
5w30 in the winter 10w30 in the summer.
5w30 in summer 5w20 in winter