sorry for bringing this back from the dead but im getting similar problems... i just recently changed my oil from regular to synthetic (rebuilt motor) and i noticed minor oil leaking down the block. Also, i have white smoke blowing out from the exhaust during a cold start... once the car is warmed up it stops... i also did the dollar trick to see if i had a bent exhaust valve.
- place dollar near muffler and if it sucks it in, you have a bent valve
im a bit worried on what it could be... the car still runs but i want to get this figured out.