Want to DIY differential fluid change myself
1. GMC recommends
rear differential fluid 75w 85
front differential fluid 75w 90;
Can I use 75W 85 for the front differential? is it supposed to be better than 75w 90?
And I live in Canada, it can get to -45 celsius in the winter, -10 and below from Nov. to next Apr.
2. How much I need for the front differential fluid change? how much I need for the front?
Thanks guys!