I am in the process of repairing the front diff on my Losi lst xxl2e. It currently has grease in it. I have 3 questions:
1. Should I clean out all the old grease and replace with new grease/oil, or is it fine to leave the old stuff in?
2. Should I use grease or should I use diff oil?
3. Which grease or oil would you recommend; weight, brand etc?
Thanks.