The initial question "...............Dachau and Oberschleissheim. Has anyone flown into these before?"
No idea regarding Dachau, but flew into Oberschleissheim about 3 years ago .... just checked log book .... it was in June 2003 ... how time flies! ...
A nice place - friendly people - They put our aeroplanes away in their packed hangar overnight - unasked and free - Avgas available and cheap landing fee.
The runway is/was about 800m long and appeared quite wide, but be careful as only a narrow section (ithink it was the southern portion) was useable as runway.
We landed (6 aeroplanes were on tour around Germany, Czech Rep., Hunrgary, Slovinia etc.) in quick succession on runway 08. This necessitates a backtrack to exit the runway at the threshold of 08. A/c's were asked to hold on the northern side of the runway whilst other traffic landed (including home bases SLG's etc) The landing traffic was very close and one hoped that they didn't screw it up and that their braking was a) reliable and b) ...errr.... careful.
Once a gap appeared in the landing traffic and cleared by Schleisheim Radio, we all made a mad dash to backtrack and exit the runway as fast as our little Goodyears would allow us!
I seem to remember that we used the ex-Olympic rowing track (Track? Rowing? Well anyway, the long thin water lake thing) as the turn point from left base onto final for 08.
Have a nice flight.
Other than that, a pleasant stay and adequate access to Munich.