I was ready to use 15/40 in my 640.I had loss of lift when the oil got hot.I had 134 in the hydraulic system for many years.I found the MF infor mation but went with the reccommedations is the Ford Service Manual and used 90wt GLI.That fixed the loss of lift.It made sense that an oil that thickened when hot would fix the problem.A Hydraulic serviceman told me that a worn pump would bypass oil as the oil thinned and that adding STP would help or going to a thicker oil would fix the loss of lift power.He was right and the expert BS birds on here were wrong.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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