Posted by Todd Wilson on Sunday, October 07, 2007 at 23:46:31 :
In Reply to: Does cheaper quality oil give you lower oil pressure reading posted by Jesse on Sunday, October 07, 2007 at 19:34:48 :
Cheaper oils can do this. Also may be a sign that your bearings are wore.
I would not run less then 10w40 in the flathead. DO NOT RUN SYNTHETIC oil in an old engine. Syn oil is famous for also causing little or no idle oil pressure.
Could also be a weak spring in the oil pump.
Todd
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