My X5 just turned 100k miles; greatest BMW ever, no issues and great diesel torque and milage. Transmission started jerking very sporatically, in Comfort/Sport/Eco mode. I can't make it happen, it does of it own accord. Dealer said no codes and couldn't replicate...for $200 charge. Have never changed fluids in transfer case/transmission, ("lifetime fill"). Any ideas if that would help/cure the problem? Understand about a $500 charge.
