You can put inoil addatives {like STP} to help them last. There is also a thing called "Overhaul in a can" which I have used with limited success.
Worn engine rings or valves Worn engine rings or valves
An engine with bad rings can last anywhere from a few hundred to a couple of thousand miles, depending on the severity of the damage and driving conditions. Poor compression from worn rings can lead to decreased performance, increased oil consumption, and potential engine failure. If left unaddressed, the engine may ultimately suffer significant damage, necessitating a rebuild or replacement. Regular monitoring and early intervention can help extend its lifespan.
Worn engine parts. Rings, bearings, etc.
worn piston rings
It is time for an engine overhaul. The pistion rings/ oil rings and compression rings are either broken are worn out. That is called blow-by. Your engine is done.
Possibly worn cylinder bore(s), or worn out or broken piston rings.
Your engine is burning oil. The usual causes are worn out valve guides and seals, broken piston rings, worn rings and scored cylinders which all amounts to an engine overhaul. If you have a turbo charger on your vehicle, it may have gone bad.
The typical causes are worn piston rings or valve guides.
The piston rings may be worn out .
Worn piston rings.
"Blow-by" is not good for any engine. It indicates worn internal engine parts (rings)
burning oil is caused by worn and broken valve seals,or worn or broken oil rings on the pistons