Old Outside A/C Unit - replacement vs repair?
If the unit is starting and not make your lights go out or dim I would not change it. All contactors have have some evediance of arcing after a short time again since the cap is good and it is starting it really is fine. Last if someone wants to change out the outside unit and continue using the inside unit RUN AWAY! I have seen two many times where someone tried to save a few bucks and the new unit failed in 3 to 5 years, I would only do this if the old refrigrant uses the same type as the new poe or pag oil is what modern units used very old ones used mineral oil. So I agree if it is not broke don't fix it you have a functional unit, companys do free inspections to drum up business in my area and I think it is a scam.