I have a 1990 LeSabre with 215K miles. The last two times I have changed the
oil the first time I crank the car up to drive it off of the ramps the
engine knocks like there is no oil but as soon as the oil pressure builds up
there is no knocking. It only knocks for a second or two. I have had the car
for five years and have put 115K on it myself. Should I be looking at having
the oil pump replaced or is this normal for a car with this many miles? Also
if the oil pump needs to be replaced how hard is that? Thanks.