I am having Passo 08 import 13
After 1500 km drive, reduced 1 lit engine shell oil 10w40 grey packing.
Water reduced 1 tea cup after 350 km drive with ac on during complete journey.
Fuel consumption 10 km/lit @ 120km/hour. on motorway and 12.5 km/lit @ local roads.
AC output approx 50%.
Gives white smoke on high rpm. During Normal warming up smoke not visible.
Humidity felt on hand while placing hand behind silencer.
What do you diagnose. And what is possible solution. A mechanic suggested to use oil 20w50 and then observe which will be experience. Any recommendations wrt engine oil.