From the 1940s till the late 1970s that used to be the problem. Each season had its functional oil lubricant usually known as mono-grade oil. Nowadays the technology has changed and most of the products are multi-grade oils, meaning you shouldn’t worry about changing your oil during the change of the seasons.
Motul is the first lubricant manufacturer to introduce multi-grade oils. Multi-grade oils are oils that meet the requirements of multiple grades where one can be that of winter (5W) and the other to be used during summer (40) so one can simply say it takes the benefit of both worlds to create the perfect blend.