Which app for ios and VW?

Hello, the following OBD2 adapter has arrived todayhttps://www.amazon.de/…/ref=oh_aui_detailpage_o00_s00?… I would like to use this to query error codes and to have data like e.g. the oil temperature displayed to me from time to time. Which app is recommended for this? I already tried EOBD-Facile Auto-Doctor Car Scanner Carly Except Car Scanners have all worked immediately but I could not see the oil temperature with it. Is the oil temperature already manufacturer specific and can r to be queried with paid apps? The car is a golf 5 gti.