The Honda Extended Life type 2 coolant in his car right now says it protects to -34°F, and he does have a block heater installed presently. It was a Christmas present last year from his worry-wart dad ... and he reported that the car was noticeably easier to start in January & February after it was installed & used. I was thinking of simply adding a quart of the concentrate antifreeze to give the -34 limit a little extra help for those times the car sits turned off for several days. His car may be perfectly okay, but I'm still a dad who worries about his kids no matter how old they get or how far away they travel.