I saw Mobil 1 0W-40 european formula this weekend... previously I had only seen 5W-30, 10W-30, 15W-40. Now if the W number is how it flows when cold, and the second number is hot it flows when hot... or is that an over-simlification?
Would 0W-40 be better than 5W-30 in the cold and just as good as 15W-40 in the summer?
What's the lowdown on this?
Would 0W-40 be better than 5W-30 in the cold and just as good as 15W-40 in the summer?
What's the lowdown on this?