hi just got this car had for a week and noticed oil comeing from back of rockerbox gasket i changed that and its still leaking from same place the middle bolt somebody tryed to tighten that and snapped it i got it out and put a new bolt in, should i have used some gasket sealer, the oil is dripping on exhaust and smelling the car out i would say tiny drops but its the smell thats getting to me any tips guys thanks in advance frankie