Anyone has viscosity curves of M1 and GC?

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Aug 20, 2003
Washington, DC
I was wondering does anyone know where can we see viscosity curves for direct comparison between M1 and GC and between various M1 weights?
If you PM me I can email 2 charts to you,
M1 and Drive Clean family of viscosities.

You can chart any additional oil on the chart as well by using the published specs for 40 & 100 deg points.

From what I have read here however I suspect that once an oil is heat cycled in an engine and goes through the shearing process in the engine, the actual viscosity at a given point is likely going to variy between brands because of differences in VI quality, inherent VI of the base oil etc.

Seeing the numbers on paper is interesting though. It gave me a better perspective on how the viscosity varies both by grade selection and temp range.
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