They make 'stop leak' to go in the oil ? WOW... but I would change it as soon as you can...

If memory serves me right... at the rear of the engine there are at least to access holes to the oil passages... which are sealed by balls driven in the hole...these are access holes for cleaning the oil passages when cleaning the block... that might be a place at the location you are talking about to check out....and one which 'stop leak' might actually work on ....