I bought a used galant, he has a gas system from Prins. I have heard, independently of two very different mechanics, that one should drive one third tank filling with petrol, because the combustion temperature is much higher with gas than with petrol and there with gas also no lubricants like Parrafine etc are included. These are according to this information in the petrol and therefore the advice to drive again and again with petrol. Has someone experience with it. Does not know if that is true , I also know a few people who, except when starting completely with LPG without switching to petrol and even over years, 300000 km and more. If I drive on gas very fast, the light is reported to my Galant, which says that something is not right with the exhaust gas cleaning. On petrol this does not happen, also not at 180 km/h. Is this perhaps because the KAT gets too hot, or is already half defective. Lambdasonde?? Who knows each other?