Original type "A" trans fluid was 20wt non dergent oil with a red dye. It was used in auto trans and power steering applications. Then the next generation fluid had additives added, for oxidation and friction modifiers. Delco spec had more friction modifiers than the ford spec, so there where two types of oil at that time. Also around that time, sperm whale oil was used as it had better viscosity control than 20wt crude. IIRC around '74? the sperm whale oil was outlawed and replaced with a modern multi viscosity oil. As by then oil had improved a 100 fold and could provide better characteristics.
HD motor oils can "super clean" a power steering system and by cleaning, cause worn seals to leak. However if the seals are already leaking, into the crank case, then motor oil is usually preferred to reduce contamination of the hd engine oil with light duty hydraulic oil.
Lots of new hydraulic equipment is now calling for hydraulic oil with "anti-wear" additives so the line between hd motor oils and hydraulic fluids has been blurred. Also more pressure, higher flow rates, higher heat in hydraulic shifting applications have called for "synthetic base" hydraulic fluids further blurring the line between the high end motor oils and high end hydraulic fluids.
Old power steering systems ran 300 lbs of pressure, where 2800lbs and more are being run in some combination systems today.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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