Check. I plan to use oem fluid to break it in and then fill it with the good stuff to help with the high temps on track. Hopefully higher temp fluid, Z1 rear diff plate with more capacity and cooling fins, and temporary exhaust wrap around the diff will solve my heat issues so I don't melt the abs sensors again.

Is there a certain amount of miles I should put on the rear diff before changing the fluid? I probably only do 300-500 miles/mo. on average.

 

500 feels too soon, but I really don't know. I think I went at least 1500 miles, but that was because I had to work myself up to DIY the gear oil swap. Anyway, there was a fair amount of sludge on the magnet.