The coolant temperature limitations for the DB 605A were - at SL, slowly decreasing with altitude - max 102* Celsius coolant for long periods, and max 115* Celsius for short periods not exceeding 10 min.
Oil limits were :
Inlet : avarage 20* C, normal 75* C +/- 5* C, max. 85* C vorübergehend
Outlet (s.L.): normal 125* C +/- 5* C, max. 135* C vorübergehend
Outlet (VDH): normal 110-120* C vorübergehend
There are two transcribed reports on a /trop version on my site which may have interesting bits for you (aircraft is Black Six).