The engine will be losing compression, and possibly burning oil. Check each cylinder to determine the compression. The loss could also be caused by a valve problem.
bad valve seals, bad piston rings bad valve seals, bad piston rings
Worn piston rings, bad valve seals,
bad piston rings or a bad cylinder all together look up a rebuilder bad piston rings or a bad cylinder all together look up a rebuilder Worn piston rings and or bad valve seals. Could be from high mileage or poor maintenance either way there is no cheap fix.
If you're getting gasoline in the oil, then you have bad piston rings that are allowing gases into the crankcase. You can find which piston(s) have bad rings by doing a compression test; a cylinder with bad rings will have lower compression.
loss of power
smoke loss of power
you don't fix piston rings. if you have bad rings you have to pull the piston and replace them. on most vehicles you have to pull the engine, then you take off the heads and oil pan. unbolt the caps from the bottom of the rod and push it out the top.
bad piston rings
Bad piston rings. Get new engine.
You might have bad piston rings, main cause of that because once you wear your rings out your gas is then able to seep past your piston rings into your oil and into your pan.
no, you have bad piston rings
The piston rings create a seal between the piston and the cylinder wall.