My dad has a '91 Chevy with a 350 in it (around 150,000 miles on it), the intake manifold gasket was recently replaced by a mechanic but shortly after that the oil pressure dropped to about half that it used to be so we sent in an oil sample to a lab. Finally got the results, although so far just verbal not the actual print out:
The mechanic said there was significant amount of anti-freeze and traces of steel and aluminum. He said the aluminum comes from the bearings.
Aluminum from bearings??? I am not expert but I cannot fathom that any bearings would be made out of aluminum!? I'm wondering if he used poor technique when he was removing the old gasket and got aluminum in there from the scouring pad and now is just trying to cover his tracks? He is a well known mechanic at a small town so its not like he is a scam artist but this still sounds very fishy to me. What do you think?