Ron Burgundy Time-out now... Putting that muck fluid in your cylinders could bend a rod if you hit the starter and it has a cylinder come up on a commpression stroke. So be careful on that front. The fact your oil is leaking thru is a good sign,if ATF is able to seep thru the ring gaps may be in OK shape in there. Keep pitching that smell of MMO when she fires is like tyre smoke to a nascar fan !!!