I use Ultimate racing diff oil but people use all sorts. I dont think any one brand is better than the other but there are differences, so once you decide on a brand your best sticking to that brand.
Indoors on carpet/cork flooring/slippy surfaces i generally run 7,000 in the rear and 12,500 in the front. If you need more on power steering then thicken up the front. The higher the grip is on the surface your racing on the higher you can go up in oils. Its all about playing around and finding what works best for you.
Craig Collinson
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