1977 SAE oil ratings

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Specifies a Max viscosity at -18 deg C of 2500 cP for 10W, and 1250 cP for 5W.

Source: Shigley & Mischke "Standard Handbook of Machine design."

The tempeartures used to define viscosity ranges have changed a bit over the years. Aren't limits set at -30 (10W) and -35 deg C (5W) now-a-days?
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I am at work, and I stumbled upon this... figured I'd share.
 
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