Notes for Service department
General notes
Condensate that forms in the crankcase due to short distance driving can influence the permittivity. As water enters the engine oil and mixes with it, moisture also collects around the oil level sensor. When excessive moisture or water is present within the crankcase: Individual instances of incorrect oil level displays may occur, while a spurious warning indicating that the oil should be topped up is also possible. The diagnostic system can process this "spurious oil-level warning" with fault pattern selection in an operation that also assesses the permittivity of the oil. However, there is no direct display of the permittivity. Among the factors that affect the oil's permittivity are its viscosity and its age. This means that an accurate assessment of oil quality cannot be guaranteed under all conditions.
The display messages available for the electronic oil level check can be found in the Owner's Handbook.