Quote Originally Posted by AusS2000 View Post
Mao, you're an automotive professional right? Care to explain what the number before the w is?

Here's a little help if you're having trouble with it:
http://www.funtrivia.com/askft/Question33842.html

And a bit more trivia for you. 0 degrees F is -18 degrees C. When is the last time it was -18 degrees over your way?
I was told that the W "stands" for winter, and the 5W is better for colder areas in the world where it gets to like snowing stages, while 10W is good for our country because it's never that cold lol.

In other news, I bought 10W-40 Royal Purple today for $90. This shit better work haha