what i used to do for oil leaks on the front seal of my old chevy IROC (motor # 2 and 5) was wipe it clean with gas, then just apply silicoln. silicoln does not hold pressure, but this is a seeper, not a gusher. good luch though and be sure to remove all silicoln before reinstalling as you do not want this isn your engine!!!!
Joe
Joe