Originally Posted By: Bjornviken
Yepp they do have the most car spec of all brands and its a awsome oil. But for now when winter is coming i need a thinner oil and the normal viscosity they sell in stores for petrol cars is 0w-40 and 5w-40.
Winter can be as cold as -30 C
0WXX oil is tested for cold cranking at -35C and pumpability at -40C, and 5WXX is tested for the same at -30C/-35C. The "XX" doesn't matter for the cold performance testing, they all have to meet the same specs.
Now, there are some oils that will have more margin than others in meeting their cold performance specs, but an oil that meets 0W cold specs must be marketed as a 0W and not a 5W, for example. The exception here is oils marketed as straight grades, some oils that are sold as SAE30 are known to be able to meet 10W30 cold specs.
Maybe you are not interested in 0W40 oils because they will be more viscous than what you have been using at normal operating temperatures, but they should be fine for your cold start needs...5W40 might also be OK, but I will say that I have experienced some 5W30s starting much better than others in the down to -25F/-32C temperatures that I will occasionally experience in the White Mountains on ski weekends where I park outside overnight. My next oil change later this month will use M1 0W30 AFE if I can find a dexos1 Gen 2 jug of that or Pennzoil Gold 5W30 that had extremely good cold test results for its grade.