straight weight shearing?

[Curious Kid]

Good stuff. For some reason I've lacked the association.

That's likely another rung up the ladder, but still no end in sight!

Take care.

 

[G-MAN]

Quote:

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The bottom line is that in the absence of something as fuel dilution the only problem in regards to viscosity will be oxidative thickening in a straight 30 grade oil.

A model may go as this:
Over a time period the oxidative thickening will increase the viscosity from a 30 to a 40 wt. oil in a straight grade 30 oil.

For a 0W30 grade oil with viscosity improvers the oil may thin first to a 25 grade then thicken to a 35 grade over the same time period.

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I properly formulated SM rated oil, whether it's a straight grade of multi-grade, shouldn't have a problem with oxidation so long as the OCI is kept reasonable.