i have a 1988 50hp force. i noticed water/oil mixture leaking from one of four bolts that connects lower gear to foot.( im not sure if im using correct terms) took it to local marine and they found fishing line wrapped around prop. they also found that the bushing inside prop was bent. they pulled out the fshing line and told me it would be $4000.00 to install a seal kit. i didnt have the seals installed. i brought the boat home and ran motor in water drum for just a minute. could not see any leaks. pulled motor out of water and waited for it to dry. i found black oil leak at same bolt as before. not enough to even drip. is it gear lube and do i need seals replaced? i dont want to spend the $400 unless im sure its neccessary. thank you to anyone that can give me any advice. harry