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Message: <blockquote data-quote="Mustang Guy" data-source="post: 120588" data-attributes="member: 13485">Adding distillate diesel fuel to a hydraulic system for any length of time is a pretty ignorant slack-jawed idea. Yes, they are miscible but the diesel will dilute the paraffinic base stock of the hydraulic oil, and worse, it's anti-wear additives and modifiers, not to mention taking the viscosity to the basement (Have you performed an oil analysis?). If you're going to be operating consistently in sub-zero arctic conditions there are cryogenic hydraulic oils formulated for that purpose - ISO AW 10 and ISO AW 22. ISO AW 23 hydraulic oil has about the same viscosity as SAE 10 motor oil, so if you really feel the need to tinker with viscosity dilute with one of those oils. For me, I use a multi-grade hydraulic oil (ISO AW 32/46/68) in all of my machines, and it works equally well summer and winter.But y'all do what ya want.</blockquote>