12-18-2012, 10:56 AM
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#37
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Senior Member
Join Date: May 2010
Posts: 3,099
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Re: Transmision and Rear End Fluid question.
Quote:
Originally Posted by RonC
Your correct Tim, The 680 weight is an ISO Viscosity which is approximately 140 plus SAE Viscosity
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Those flow charts are very general in nature and misleading. Look up specific lubricants and you will find just that. Look at the viscosity at 40 degrees Celsius as that is the closest to our operating temps. ISO 680 is actually a little heavier than SAE 250. Ford changed to SAE 250 in 1932 except in sub-freezing temperatures.
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