1995 Buick Century Question: i seem to have a leak were there looks like a plug or hole like a distributer .

You are correct, That hole is where the distributor used to be in that engine block. The ignition system in your 1995 Buick Century does not use a distributor. What is in the hole however is not a plug, it is a gear driven shaft that drives the oil pump just as the distributor shaft used to do. There is an o-ring at the top - just like a distributor o-ring. The o-ring is probably hard as a rock and not sealing any more. The oil pump drive will need to be removed and the o-ring replaced. Even with everything out of the way it can be a bit difficult to remove the oil pump drive. If you find you need the help of a repair shop please use the following link to find one near you - http://repairpal.com/directory?address=46227&car_bran...