Hello, I have a Kadett D Caravan Diesel, which runs perfectly in summer, but has massive problems in winter to start. Due to the mileage of almost 450,000km I assume that a poor compression is the cause here. Now I have thought to warm up the sucked air with the preliminary glow (approx. 80W, parallel to the glow plugs, self-construction from soldered weed plate with heating spirals from an old hair dryer as purpose in front of the air filter). Greetings, Oliver.