Found it. Per the Oracal spec sheets (or the Oracal USA app available for iPhone and Android), the temperature resistance of Oracal 651 film is -40° F through +176° F. Oracal 751 is rated up to 230° F - ditto for Oracal 951.
Here is what I found in a quick search.I cannot find max. temp. for Oracal 651. Does anyone know? Thought I read 170 F awhile back.