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Old 03-12-2008, 02:05 PM   #10 (permalink)
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Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 58.34 mpg (US)
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Originally Posted by LostCause View Post
75W90 is equivalent to 5w30 I believe. Transmission fluid and Engine oil use two different viscosity ratings.
That's the first I've read about dual viscosity rating systems for gear vs. engine oil. Can you point to a source about that?

I can tell you that 75w90 gear oil is absolutely not the same viscosity as 5w30 engine oil, because I compared them by pour testing at the same temperature through a filter. There's a dramatic difference.
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