I have this problem with my 2003 G400 cdi. It starts badly. All looks Ok heater light and all. but when i turn the key, it turns the engine for a long long time be-for it starts up. It happens both with the engine hot and cold but some time it starts Ok. Can you help me with this? this is not good for i have a 250 Benz who has bin running perfecly since 1976 and ilooks like new. ap