I see there is no agreement on the viscosity of HY-Tran fluid. We are always told in service training it was multi grade. It does hold it's viscosity very well when it gets hot which indicates it has substantial viscosity index improvers added. Earl Kramer preached this many times. There was two weights back in the 90's but I don't know if there still is and I never saw the lighter weight. It was for severe cold weather operation.
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