Hi I concur with Carl & Susan, Lippert has a viscosity sheet showing which viscosity fluid you use with the temperature range that you will be operating in. As a further note: It would do you well now to re&re your fluid anyway, this is a maintenance that few owners "ever" think about ? Remember, just like brake fluid in your car, the reservoir is "vented" to atmosphere, so when the rams are driven out, a momentary "lower" pressure is created in the reservoir, & any dirt particulates in the air are drawn in, the fluid will absorb those.
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