An engine consumes excessive oil and oil is found in the combustion chamber. What action should be taken?
Replace the piston rings
Oil reaching the combustion chamber and being burnt means it is passing the piston past the sealing rings.
The oil-control (and worn compression) rings are the parts meant to scrape and seal oil off the cylinder wall; when they are worn or stuck, oil is drawn up into the chamber and consumed.
The correct remedy is to restore that seal by replacing the piston rings. Merely draining oil or thickening it does not fix the leakage path, and main bearings do not seal the combustion chamber.
Hence, the piston rings should be replaced.
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