Hiho, As some might have noticed, I overtaken the cylinder head in December due to increased oil consumption (2-3L to 1000) . He drives himself also Prima. I used a 5W40 oil. Well, after 2x 500KM I had to notice it still takes 800Ml-1L to 1000 Km and the spark plugs always “oil” . That greatly increased the fuel consumption after 500Km and a bad start and driving behavior . Clean and clean with it, now I have the same result. I am radically thinking and considering a high-quality 15W40 and new candles. Suggestions would be nice !