My mechanic says the distributor's o ring is leaking oil in my 1992 Honda Accord. How can I be sure and test it out myself to confirm? There is oil just below and to the right of the distributor on a hose that connects to the valve cover area, but it could have come from when my valve cover gasket was leaking. The car only has 45,000 miles on it and runs well. How long does the o-ring, distributor cap/rotor, and distributor itself last? When I used to own GM cars, I remember repair shops suggesting replacing the cap and rotor as part of a "tune up" but those were the old days.