Quote:
Originally Posted by BRENT in 10-uh-C
You may be correct but I am pretty sure the S/B makes reference at least once to the 600W as being the viscosity. The sentence was something like "the gearbox must use a lube equal to 600W.". It has been argued over and over and I don't know the answer, but I think the compelling argument has always been if 600W was a trade-name and not a viscosity, why wouldn't the Ford engineers have specified the necessary viscosity since '600W' was not Ford's own tradename?
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Here's the relevant bit from the service bulletins.
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