Ask your local hydraulic gurus about what they have available as a "Sock" that you drop into your sump, or a filter to scrub your tractor hydraulic system of the water that COLD starts, and operation in cold blowing snow conditions WILL inevitably accumulate. When you pull a level or drain plug and it hasn't got a magnet,....PUT ONE.

Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain