I could have sworn I saw higher pressure with lower viscosity oil and it seemed counterintuitive to me also.
I assumed lower viscosity = lower pressure = higher flow rate but my observation (as I remember it) was opposite, pressure wise.
I don't really worry about it as I never see pressure drop below 20 or so at any time.
not sure how we could measure flow rate anyway
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john
'77 catalina 30 #783
the only way to be sure is to make sure
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