Hello,can anyone teach me about the diff oil...I don't really understand about it...For example ,what compund of oil should be run on a large and high taction track... and so on..

Thank You

Good place to start on most cars is about

60k in the rear, 300k in the front.

The heavier oils in the front make the car easy to drive, and the lighter oils in the rear make the rear stick..

You can go too heavy on the front and it starts to act like a spool (maybe you want that?) and you can go too light on the rear and it starts to diff out.

If you run too heavy on the rear say like 100k it's going to have a LOT of steering and be hard to drive.

40k-80k is normal for the rear
100k-500k is normal for the front

experiment and speak to local drivers who run on the same tracks as you.

When you say "diff out" what do you mean? Thanks

The tire with less contact during cornering is spinning freely while the tire with more contact is hardly spinning at all.

This results in less traction and increases the chance of spinning out. This is most common in gear diffs although it can happen in ball diffs solution is to add thicker diff oil or run your ball diff tighter