Posted 20 December 2010 - 06:50 PM
poppers will not help in the slightest. the door is a "wet area" meaning it is not sealed to the outside elements. it's pretty much impossible to attain this anyway if you have sliding windows! You'll find that 99.9% of all cars are like this. Also, one part of the lock that can freeze is the catch itself. It's on the outside of the door and again can never be isolated.
Using poppers all you are doing is creating a problem for yourself if they fail. With no mechanical "backup" you'll just get stranded.
If you basically keep the lock lubricated properly, as Woody has said, with a dry graphite lube (look in the bike department at halfords for chain lube) and also use a decent quality silicon lube (not WD40.. i've had that freeze on me) in the other places to repell the moisture, and also use the same silicon lube on the door seals (just wipe on with a rag), then it's about as good as you'll get regardless of which handle you've fitted.