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30lbs vs 65lbs ... new oil is maybe a factor - temp more so and various oil viscosities - I am in a hot climate running 15/50. Also revs make a huge difference - 100 revs difference on idle could account for most of it.



I was trying not to be overly optimistic, I'm running Castrol 20-50 4T and Western Washington State in May really doesn't get real warm out. Still pleased though with the pressures I've noted so far. I could live with a minimum 25-30 Lbs. in all Temps. and circumstances handily.