1. Valve Seals: Worn or damaged valve seals can cause oil to leak into the combustion chamber, resulting in oil burning.
2. PCV Valve: A faulty or clogged PCV (positive crankcase ventilation) valve can lead to excessive pressure in the crankcase, forcing oil past the rings and into the combustion chamber.
3. Oil Control Rings: Although you mentioned the rings are good, it's worth double-checking the oil control rings. These rings specifically help regulate oil consumption and prevent it from reaching the combustion chamber. Make sure they are functioning properly and not damaged or worn out.
4. Piston Rings: While you may have checked the rings, it's possible that other piston rings besides the compression rings could be the culprit. Damaged, worn, or incorrectly installed piston rings can cause oil burning.
5. Cylinder Bore Wear: If the cylinder bores are worn or damaged, it can allow oil to seep past the rings and into the combustion chamber.
6. Turbocharger or Supercharger: If your Chevy 350 is equipped with a turbocharger or supercharger, it may consume more oil due to increased pressure and heat in the engine.
7. Oil Viscosity: Using oil with an incorrect viscosity can contribute to oil burning. Make sure you are using the recommended oil viscosity for your engine.
8. Leaking Oil Pan Gasket: A leaking oil pan gasket can also cause oil to drip and burn on the exhaust system, giving the impression that the engine is burning oil.
9. Intake Manifold Gasket: A faulty intake manifold gasket can allow oil to leak into the intake port and eventually be burned in the combustion chamber.
10. Rear Main Seal: A worn or damaged rear main seal can cause oil to leak from the back of the engine and onto the exhaust, resembling oil burning.
It's important to thoroughly diagnose the root cause of the oil burning issue to ensure effective repairs and prevent further engine damage. If you suspect any of these potential problems, it's best to consult with a professional mechanic for further inspection and assistance.
