I’ve got my third HPDE this weekend and I feel like I’m being paranoid about my trans/diff fluid. I’ve got 15k miles on the car, two track days and 3 autocross events. I’m doing the oil change tomorrow morning (6k mile interval), the RBF600 brake fluid still looks good(done the week after I got the car), and the Gloc R10 pads still have plenty of life left in them (track duty only). The manual says trans/diff fluid should be changed every 30k miles but I’ve got a nagging feeling I should change it this week. Should I go ahead and spend that $200 to get the fluids done?