Aztec Winter flying Questions!!

[1974pa23250e]

Hi I have a Aztec and want to do some winter flights im expecting flying and overnighting the aircraft in temperatures down to -30. This engine already runs cool 225 in -8ish temps. My questions what is the coldest I can safely have the operating temps on the engine at ? and if there is any aftermarket winter fronts to help this engine stay warm in the cold? if so where can I get them?

any other information and how your operating your Aztecs in the cold would be of use also.

thank you

 

[N964MM]

 

[Tombaum]

 

[Jeff K]

 

[JimICS2452]