Hi Folks… me again, but no Tranny questions here!
I think the wire to my oil pressure gauge might be shorting or loose, since the needle sometimes swings from 0 to the middle unexpectedly for no apparent reason. However, during my recent 350 mile trip back from FL to North GA, I noticed that while “stable”, the pressure seemed to be ever so slowly dropping to the 1/4 area of the meter. I checked the oil level at every stop and it was never more than 1/2 quart from full. It did seem somewhat “black” given that I changed it and filter about 1,200 miles ago. Also, it seemed the oil was somewhat “channeling” on the dipstick… hard to explain, but it wasn’t 100% coating the dipstick like I’d normally expect and seemed like wouldn’t “stick” to it. Anyway, there wasn’t any foaminess that would seem to indicate water in it… and I’ve never used any oil additives.
What can cause reduction in oil pressure? After sitting, it seems normal for a while after start-up but then tends to drop. It is possible there is some kind of “sludge” clogging something? The tranny repair guy told me that some oils contain unacceptable amounts of paraffin (a WAX)… told me to never use Quaker State and that he recommended Valvoline. He was “amused” when I told him I use the Walmart brand… Tech or something in the blue bottle.
Of course, I’ll change the oil THIS week… is that likely to resolve any problems? What else can cause loss of oil pressure? From what I can tell the engine seals are OK since there are never any “puddles” underneath. Any thoughts are appreciated- thanks.