Stuck rings.
Rings should expand out from the piston grooves against the cylinder walls to provide either increased compression or wiping away excess oil
from the cylinder walls. Stuck implies that they are not contacting the cylinder walls usually typically either through an excess of carbon
build up on the bottom oil ring from a lack of oil changes or through an overheated engine that typically can stick the top two rings on an
older engine and exasperated by a lack of oil changes also.
Rings should expand out from the piston grooves against the cylinder walls to provide either increased compression or wiping away excess oil
from the cylinder walls. Stuck implies that they are not contacting the cylinder walls usually typically either through an excess of carbon
build up on the bottom oil ring from a lack of oil changes or through an overheated engine that typically can stick the top two rings on an
older engine and exasperated by a lack of oil changes also.