i have a buick roadmaster that the front main seal was replaced on and the oil pan seal was replaced but it leaks oil somewhere near the oil pan it actually looks like its leaking above the oil panit gets all over the converters and flywheel which causes it to smokei at least need to know where to start looking what to try ive tightened every bolt and nut i can find a list of trial and errors would be wonderful thankyou please reply asap