Shock oil ?

Early Model A Houdaille dampers used glyserin. Many of the model A suppliers carry an oil they list as shock oil. Since the shock action and performance depends on the viscosity of the fluid used, the replacement oils were likely developed to get a viscosity that will work over a wide range of temperatures. Most folks keep there cars out of the rough weather so the temperature won't be as big an influence as it was back when you had to depend on these cars for daily use.

I'd just buy the stuff that Bratton's, Snyder's, Mike's, or on of the other Model A vendors sell. The other option would be a recommendation from a rebuilder of shocks if they have a different opinion.

Kerby
 
Ford lists in their 1950 parts book; 8A-19541 shock absorber fluid (M-4633). It is castor oil.
 
I got two sets of shocks from the supplier in Oregon. I did not read the instructions. I filled them with glycerin and the oil immediately leaked out and continued for months. My next set will be from Bill Stipe.
Vic
 
I have tried all sorts of fluids over the last 45 years. The original glycerin is ok, but is hydroscopic. A heavy hydraulic fluid works well and so does good old (but new) engine oil. I had engine oil in my 30 Fordor shocks for 40 years and one has just started to leak, and the car performed well in all conditions and roads.
 
Go to a motorcycle store, look at their selection of "fork" oils ---the more worn your shocks are the thicker the oil you need.
 
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