Fuel dilution not uncommon on Turbo direct injection engines. Same issue with my 2018 GT Sport.I know the manual says 4.8 quarts of oil for the 1.6 turbo in my Elantra GT N-line, but it shows over the full line on the dipstick every time I change the oil and filter.
Fuel is being introduced into the oil, thus diluting the oil and lowering viscosity. Probably why a few years ago Hyundai issued a technical service bulletin recommendeing changing to 5w-40 oil for these 1.6 turbo motors.Fuel dilution not uncommon on Turbo direct injection engines. Same issue with my 2018 GT Sport.
Impact of Fuel Injection on Dilution of Engine Crankcase Oil for Turbocharged Gasoline Direct-Injection EnginesTurbocharged gasoline direct injection (TGDI) engines often have a flat torque curve with the maximum torque covering a wide range of engine speeds. Increasing the high-speed-end torque for a TGDI engine provides better acceleration performance to the vehicle powered by the engine. However, it alsowww.sae.org