Re: Houdaile oil
Ford and Who-Die used 8 different formulas of fluid before settling an the final formula around 1938. Mineral oil, glycerin, and castor oil were all used with varying mixes with alcohol & glycerin and varying viscosities of the different fluid formulas. The final formula was mineral oil with an approximate viscosity equivalent to SAE 50 motor oil. With mineral oil, there was a recommendation to open the fluid needle more during cold weather operation for model A cars.
In the modern era, a person may have to experiment with different viscosities of hydraulic oil to get a formula that works for their climate application. Hydraulic oil has anti foaming additives that would make it the best consideration for this design of shock absorber.
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