Hello guys, I converted my car with the Flexitune Auto X4 (Swedenbox) device last weekend. So far I have not been able to test with pure E85, because the tank is still too full. But my question is, do I have to change spark plugs and the engine oil? In about 1200Km there is an oil change, but do I have to pay attention to something? Other engine oil or something like that? I also read that some say you should change the fuel filter. Did you do that too? ? I now have 53000 km on the clock, is it advisable to change the filter or only for cars with more running power? Thank you