Hey, I've got an old diesel Mercedes Benz 300D. Great car, its got over 300K on it and I very rarely have to do any work to it. I've noticed recently since its been warm that after I run the car for a while it won't start? I can hear the ignition trying to engage my starter but the starter won't turn over? Once the car has cooled off the starter works fine? Works fine in the morning and after its been sitting at work all day, it starts up fine. But if you run it for half an hour and try to restart it, nothing? Could it be something else besides the starter? Thanks for your help. Mercedes mechanics around here charge 150 an hour! Thank goodness the car its easy to work on.