It depends on the situation.
Piston ring quick fix.
The rings ride within annular grooves in the piston.
Each piston in your car s engine is equipped with two separate compression rings toward the crown of the piston and an oil control ring assembly toward the skirt.
The yata had a stuck engine as in would not turn.
The rings expand against the cylinder wall and seal the combustion chamber.
Actually it was much worse.
If its a car that car been sitting for a while you can probabaly fix it with out a tear down if its like stuck piston rings.
I had a miata with this problem.
You will have to buy new plugs.
However most of the replacement cost has to do with the labor behind it.
Since the piston rings are inside of your engine this means an auto mechanic will need to remove the engine from your vehicle and disassemble it so they can access the worn out piston rings.
The piston rings fit into horizontal grooves in the pistons.
The piston rings themselves only cost between 30 to 150 for the parts.
This ensures that the engine maintains a consistent level of compression.
I drained the oil and filled the engine with a combination of diesel fuel pblaster you can buy by the gallon and atf in about a 1 1 1 ratio.