It depends on your vehicle , my 1995 Ford Explorer uses 5 w 30 year round
( that's what my owners manual shows to use )
Winter 5w30. Summer 10w30.Winter 5w30. Summer 10w30.
summer: 10W30 winter: 5W30
10w40 summer,5w30 winter
winter- 5w30 summer-10w30
Yes you can use 5W20 oil instead of 5W30. One is just thicker then the other. The 5W20 is better in the winter and the 5W30 is better in the summer.
10w30 in the summer and 5w30 in the winter
5w30 in the winter or 10w30 in the summer.
5w30 in winter 10w40 summer 5w30 from 0 to 90 degrees over 90 use 10w40
Use a quality 10w30 in summer and 5w30 for winter or cold climates.
Use 10w30 for the spring summer and fall and 5w30 for the winter months
Summer 10w30. Winter, cold climate 5w30.
In the winter I use conventional 5W30 In the summer I use conventional 10W30