Some customers who used relatively cheap engine oil before may complain that after switching to high-quality engine oil, their oil consumption has increased compared to the past.

The first reason could be that the oil used previously was of lower quality, and it led to the formation of soot and carbon deposits within the engine. The oil change intervals may have also exceeded the recommended duration, allowing the soot and carbon deposits to accumulate and potentially block the piston rings, reducing their elasticity. High-quality engine oil has a cleaning effect, removing accumulated soot, carbon deposits, and varnish, which could cause the lubricating oil to burn within the engine or be expelled through the exhaust, leading to blue smoke from the tailpipe, indicating that the lubricating oil is entering the combustion chamber. If the engine is in relatively good condition, the increased oil consumption typically decreases after two oil changes, and some of the accumulated soot and carbon deposits will be cleared, allowing the piston rings to regain their elasticity.

Another possible reason could be that various engine seals and gaskets are damaged, causing lubricating oil to leak. Once leakage occurs, it can be observed externally on the engine.