So my more recent Fiero has a remote oil filter. I noticed recently, after changing the oil and having driven it a few thousand miles, also trying to find a leak in the set-up....that the previous owner had the hoses hooked up reversed.
So the oil was in effect coming into the "out" on the filter mount and going out the "in". So it was filtering backwards in the filter itself as well.
Though a little alarming to find this out. After correcting it, with a new filter too, all that seemed to change is the oil pressure is now 7-10 psi lower. Which is probably more accurate because it always seemed to read high, and numbers are still great.
If anyone has any thoughts or comments on this, cool.
[This message has been edited by 2.5 (edited 08-14-2017).]