I was searching for an answer on this topic and I didn't find a ton of information. I was curious to when/ how often you guys who do speed runs change your diff fluid. I added 300k from stock about 20-30 passes ago and I feel like it may not be as thick or effective as when I started. I also notice the car seems to stay less straight on roads with a slight angle, that before on the same setup didn't seem to affect it. I was going to swap out to 500k when I rebuild the diffs. Any information if worn out diff fluid could effect the linear abilities of the car would be greatly appreciated. For reference I'm nothing crazy with my runs PR is a 139 Mph ATM. I'm sure the answer varies greatly the closer to 170+ you go.
Thank You.
Thank You.