If there's a drain plug on the pan, is there any good reason not to drain it and refill with the correct fluid every 40K miles or so?
I know that's not ideal (old filter & not all the fluid). But it seems like that would be pretty easy/cheap and has got to be better than leaving it all in for the "life" of the car.
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My 2017 M240i: MHD, xHP, Modded OE Intake, AA GESi 400 CPSI Cat DP, Dinan Mid-pipe, M Performance LSD & Rear Diffuser, BMS Exhaust Tips, Apex EC-7 Wheels, M-Tech Front Lip, iND Painted Mirror Caps, Smoked Reflectors