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Might have to call the factory on that one. I know they used to use 90wt Castrol (the same stuff you'd put in the rear differential of most trucks) but some of the most recent reels seem to have something red colored in them. Not sure what it is...
Maybe a synthetic 90wt is worth a try, they don't thicken as much in the cold. Modern synthetics shouldn't effect your seals either, but I'd still call VS first.
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