- Overfilling the oil results in high consumption because the crankcase ventilation blows out the excess oil.
- Liquid oil burns faster than thick oil. Seasonal oil becomes liquid like water when heated, and consumption increases accordingly. All-season oil remains more viscous; first of all, those who drive long distances may notice lower consumption of this oil.
- All-season oil that remains in the engine for too long becomes thinner, the highest viscosity grade is "lost", and the need for topping up increases accordingly.
- A sharp driving style, in addition to increased fuel consumption, also increases oil consumption. This is especially noticeable if a new engine is immediately subjected to high loads.
- During the break-in period, the engine requires more lubricant.
- Engine leakage. Check according to the diagram described in the chapter "Engines".
- Engine defect; for example, a defect in the sealing gasket (oil seal) valve stem, too large gap between valve guide and sealing gasket, piston rings are defective or incorrectly installed during repair, cylinder wall is damaged due to piston scoring.
Zero oil consumption is suspicious
During winter operation over short distances, it may also be the case that the oil level between measurements does not decrease at all or even increases. This is not a reason to rejoice at all, because it means that the engine oil is diluted with fuel or condensate. This oil, which changes its properties, must be "boiled" during regular long trips so that the condensate evaporates. At the end of the trip, the oil level should be checked, because it will drop significantly due to the evaporation of parts of gasoline and condensate! During extreme operation in the city without intermediate long-distance trips, it will be better if you change the oil earlier than usual; perhaps after 3000 km or four months.
In winter, you should take into account the admixture of gasoline in the oil of approximately 2-3%, and thanks to the better dosed enrichment of the combustible mixture in our injection engines, when starting a cold engine, less gasoline gets into the oil than in old carburetor engines.
(The article was copied from the website: «AudiManual»)