Not quite so...
You should not mix MB anti freeze (clear, red, orange [blue in some parts]) with Prestone (always green). The difference in make-up can cause particulates to settle out of solution and clog the cooling vanes in your radiator. Some chemical gobbltygook about silicate versus nonsilicate and the lack of compatability between the two.
Now if you're talking about mixing clear MB coolant and reddish-orange MB coolant then all should be OK.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.