Hello forum I have a bus – Mercedes O303 – which has been parked for 7 years. Now it should be sold soon, because I cannot use the vehicle for lack of time and it makes no sense to leave it standing around. Now I should know what to do to bring the vehicle back to life without causing gross damage. The engine has not been preserved. I understand that all filters and oils have to be re-cleaned. What about the diesel? The vehicle has been fully fuelled before it was turned off to avoid rust in the tank. Somewhere I have read that the connections are decomposed and the diesel can no longer be used after a time. Are there any other preparatory work before the first start? the engine is an OM402 V8 suction engine. Thanks for your information and constructive contributions