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I Dot oil will deal With sub zero temps better than mineral oil. Which is why I use it. -15C is about as Cold as it gets near me though. I have to travel inland quite a bit for it to drop below that. I would Guess -35C would be OK. But I'm not massively keen on finding out.
Mineral oil has been reported to cause issues at low temps. Cant remember exactly what temps though.
Smallfurry
Silly question perhaps, but are hydraulics ok in serious sub zero temperatures like -35?