I'm trying to help a friend of mine to start up an old car thats been sitting for maybe 3 years or more. Its a '67 Plymouth Fury III. Ok so we tried to jump start it, doesn't work. Took the battery to the gas station to get it charge but doesn't hold a charge so probably need a new battery. So what are somethings that I need to do to get the car started up? I don't know a whole lot about old cars. I check the oil dipstick, it looks very dark should change the oil of course. I flipped through the oil section of the manual and it list 20W-40, 10W-30 and even 5W-20 for very low temperatures with 10W-30 being the preferred grade. I not really restoring the car at the moment, just need to get it started up. Thanks for your help.