Hi guys, I had my pickerl check (TÜV/HU) today, because I had too high exhaust gas values. Instead of a value of 3.6 I had 6,9. I don’t know what that means. Now the nice gentleman meant I should give such an additive in the tank that the engine is clean inside again, because it is kind of rusty??? or so. He also meant that sometimes blow out the engine, so give some really good stuff is not bad. What do you say? MfG Patrick