About this deal
In a joint venture, Ford and GM collaborated on the development of a new 6-speed FWD transaxle (6T70/6F50). Why would that particular "holy grail" additive be relevant to this topic of discussion, or indeed, to any power steering system. GM Dexron-III (H) licensed products prior to 2011 had a license number on the can that began with the letter H.
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As far as I am aware, LR recommends MTF94 for the R380, which is what I used on last change for main gearbox. Oils according to this specification have longer maintenance of friction properties and anti-shudder properties, better foam control, and a longer fluid life. The PS fluid is usually less robust than ATF, although they seem to run fine on either they don't need a ton of additives for the system.
Even landrover themselves cannot answer this question except to say Cold climate fluid is recommended but as the cols climate fluid has no composition on the bottle, they're just as unsure. The H is an additive package for an updated friction modifier and with an oxidatively stable base oil (group 2). This fluid is backward compatible with all previous Dexron fluids as well as the Type "A" Suffix "A", and the Type "A" fluids produced from 1949 to 1966. ATF Universal is formulated from highly refined paraffinic base oils with additive package designed to inhibit oxidation and offer load carrying anti-wear protection. On August 1, 2016, GM released the Dexron III (K) fluid specification (GM Spec GMW17639) as a fluid to support older GM manual transmissions and power steering systems requiring the previously discontinued Dexron-III (H) fluid.Dexron (B) was composed of a more stable, less reactive, hydrotreated Group 1 base oil plus additives to help prevent foaming, oxidation, and damage from elevated temperatures. According to GM TSB 57-02-01, issued October 2, 1992, The improvements in Dexron-III (F) include better friction stability, higher high-temperature oxidation stability, and better material compatibility. As a result, qualified GM automatic transmission fluid was made available at retailers and service garages in many places. This fluid was better suited for the higher fluid temperatures caused by the unique torque converters [7] [8] [9] and higher power engines of the day. Originally, the Dexron name was associated exclusively with automatic transmission fluids, though GM later released Dexron gear oils and other lubricants under the Dexron brand.