I'm asking on our 2017 Rogue Sport w/CVT transmission. Car doesn't get many annual miles (5k) and @ 29K I did 4X drain and fills using Idemitsu NS-3 fluid. (Also replaced the small external filter.) The factory fluid was very black. For some reason, I'll leery about dropping the pan on our first CVT transmission car. How bad could the magnets be contaminated w/ shavings and fuss? Condition of filter? I plan on doing future drain and fills @ 20-25k miles intervals. (How many would depend on the condition of the fluid coming out.) When would you drop the pan, clean magnets and install new filter knowing my service routine? Thanks for your insights.....