My girlfriends '98 Mustang 3.8 (175k) ran hot (but not yet pegged)
after it blew a head gasket.
Afterwards I noticed that the oil pressure would sometimes fall
instantly, or quiver. At first I thought this had to be the gauge or
sensor because it moved so quickly, and looking into oil filler, you
could see oil flowing. But after a short while you could hear the valves
tapping (and turning off the car and back on would restore pressure). It
appears to me that the sensor is at the pump, instead of at the end of
the oiling line.
There was a great deal of sludge in the motor, a cup or two that I
removed by hand. I'm thinking the hot engine must have loosened some up
and this is clogging the oil intake.
So, I've run a can of quick flush and cycled some used filtered oil
back through. It's much much better, but now and then I still see a drop
The pan appears to be a tough job to get off.
Suggestions? Or do I have this wrong.