Do you recommend ETK, TIS, EPC, ETM, KSD, etc.?
Do you boys rely soley on the Bentley's or are there other obligatory data sources that I need to procur?
Searching on the web, I find these additional sources of BMW information.
ETK == Elektronikteilkatalog (part numbers & descriptions)
TIS == technical information system (service instructions & specs)
EPC == prices for parts in the ETK
ETM == electrical troubleshooting manual
KSD == error kodes & man hours per job (shop rate)
Are these manuals legit?
If so, which would you suggest in order to best understand & maintain a BMW?