[Dr. Jekyll]

I understand this may be the best option / versions to get for the app OBDLink LX/MX/MX++ which would lead me to the units called OBDLINK MX+ available on Amazon as suggested by Bimmercode . I have an iPhone and wonder if this is what every else is using or can recommend?

Second question is when returning to the dealership for the routine oil change do you have to recode it all back to the factory settings?

Thank you in advance.