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Old 03-12-2008, 02:05 PM   #10 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,513

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.71 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 60.16 mpg (US)
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Quote:
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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Ecodriving test: Manual vs. automatic transmission MPG showdown



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