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Old 2nd Apr 2006, 23:08
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411A
 
Join Date: Mar 2000
Location: Arizona USA
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As usual, it depends..

Yes, true.

Lets consider.
A straight weight oil will tend to show a lower oil pressure, simply because of the oil composition.

Whereas, a multi-grade (Phillips 20W50 or 25W60 will show a HIGHER oil pressure, due to viscosity.

Yes, true and also, better cooling with the multi-weight, at higher ambient temperatures.

Surprise...surprise.
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