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mine runs 25 whether i used 5w30, 10w30, or 20w50.
i was told to let the idle fall where it may, and have read where it takes very little pressure at idle, less than 10 lbs., to keep things working. you just want your working pressure to be where it should be from my understanding.
higher flow could be preferred over pressure in some instances.
but jmo
hth
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