In addition to use and use of the machine, the maintenance depends on the engine oil consumption and the composition of the engine oil. We advise to carry out a service at least once a year or every 1000 hours. A soot filter must never be cleaned with water. The ash in the filter can contain calcium, fluorine and other substances that, when wet, form gypsum that is no longer removable from the filter. The filter is therefore irreparably damaged.