Hi,
Hope it is not too late to comment here. I have similar problems last time, and the symptoms are white smoke puffing out especially when engine is cold. as the engine is warmed to running temperature, it was lessen, but expect some occasional puffs at traffic lights stop. funny thing is, never spot any spills on the garage floor. ever.
I was topping up engine oil approximately 1 liter every fuelling period. that is kinda scary, looking at 450 to 500 km per fill up. so, my mech first try to change the gaskets, especially the top gasket. didnt really solved the problem. so, he had to top overhaul the engine, and replaced the valvetronic gaskets, oil filter rubbers, and some hoses that I couldnt identify. solved. power is back, engine is less noisy now and damage is around rm3k++. Mech is at Sentul/segambut area. he was once AB mechanic 20 years ago i think. haha.
now the car is running perfectly, with no trace of dirt on the engine bay experienced. FC is better too!