I guess that's why I have to get a new battery at every oil change.
I am aware of this thats why I spend close to 70bucks cdn for enough pure synthetic to do an oil change .Just for info, there is a reason for this.... full synthetics have a much more stable viscosity over a wide temp range. The lower weight viscosity number is tested at 100F, so down at room temp, the standard oil has thickened up while the full synthetic has not and so that is why it seems thin and runny when you pour it. That seemingly 'runny' synthetic will actually be MORE viscous at 200F than a 50W standard oil will be at that high temp.
****Spec for that engine is min 5 psi at idle hot , but I would put a known good Manual gauge on it to be aboustly sure.
mine is off each of the rear pressure ports, one 1/4" , and one 1/8" , they both read the same.X2 I had the computer in my wifes old 4.0 jeep shut the motor off one time because the gauge hit zero, the sending unit was crap, changed the sending unit and put a "t" in it with a mechanical gauge just for a sanity check, pressure was fine.
pure guess ! go w/ a mech. gaugeI figure the little white square on the far left corresponds to 0, the first fine line graduation as 20 psi, the second as 40 psi, the third to 60 psi, and all the way over to the right as 80 psi (won't ever see 80 psi).
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pure guess ! go w/ a mech. gauge
The straight 40W is acting exactly like it should. If you put in 10W40, then the pressure would not be so high when cold but would be the same when hot. If you want higher pressure at hot idle after climbing the long grade, you'll have to go to an Xw50 grade. Or try an Xw40 pure synthetic to get a bit more pressure stability.and the 40 Wt. is reading between the second and third graduation at idle when first starting up. When fully warm at idle, the pressure drops all the way down to halfway between the zero and the first graduation. And that does not bother me, but climbing the grade the other day at "full speed" with the same oil pressure as hot idle pressure is what made me nervous and the reason I started this thread in the first place.