Hi 1973 dodge,
Yes engine oil isn't good for the power steering, it causes the seals to swell. To drain it remove the power steering return hose, it will have clamps on each end of it. The high pressure hose will have acrimped end and fittings that require a wrench to remove them. remove the return hose and let it drain, refil with the correct fluid and run for a while and repeat the drain one more time and you should be ok. Thanks David.