I have Mark X 300G, 279000 km driven, engine is very smooth but reducing oil. I used 10-40 drove 1800 km and reduced almost 2liters but now someone referred me 20-50 and I am using it. Is there any role of viscosity in illuminating reduction?
Engine is completely sealed, no leakage at all and I feel there is a ring-piston issue. Can you advise me something in its solution.