From Newtis
"The measurable result of an engine oil consumption is overridden by the quality of the fuel used and of the driving profile. If, for example, in winter a lot of short distances are driven (= high fuel entry since the vaporisation temperature is for the most part only briefly achieved) and then a longer distance is driven (fuel can now vaporise), a significant drop in the engine oil level is encountered on this trip.
This does not constitute engine oil consumption, but instead merely a different engine oil level on account of the fuel content in the engine oil. Customer complaints can often be put down to this fact. The situation can arise where the engine oil level drops over a few 100 km by around 1 litre. Added to this is some engines is a degree of uncertainty of up to 0.3 litres by the relevant measuring system (oil dipstick/QLT)."
https://www.newtis.info/tisv2/a/en/e...fluids/2v3QS5F