Mercedes-Benz E-Class Engine Problems
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Fuel pump problems with a 2007 Mercedes-Benz E200k
At the first sign of a fuel pump that has started to play up, the advice is to replace it as soon as you can. These electric pumps can start to have intermittent faults where they will not pump fast enough or not at all, and then the next time you start the car, they'll work perfectly.
Don't be fooled into thinking it's all okay, however, as the pump will progressively get worse and worse until it won't work at all. Trust us, these things do not fix themselves. And since a fuel pump will leave a modern fuel-injected car absolutely high and dry, you're way better off fixing it now (by replacing the pump) than finding yourself stuck on the side of the road in the middle of nowhere.
How much oil should a 2015 E400 use?
If you aren't doing it already keep a record of the oil you put in, recording the date, the odometer, and the amount of oil added. That would give you some evidence to present to the dealer and MB. As you haven't had any satisfaction from the dealer go directly to Mercedes-Benz (Ph: 1300 730 200). There shouldn't be any reason to be scared on driving the car, all cars use oil, it's the amount of oil used that it the question that needs to be answered in your case. In the meantime check the oil level weekly.
E220 Mercedes-Benz electronics issue
There is a problem with the electronics of the car, it could be the ECU or a sensor, and it's causing the car to go into "limp home" mode. By turning the engine off and restarting you are rebooting the computer. Take it to a mechanic and have them hook it up to their diagnostic equipment and they should be able to identify the cause of your problem.
Premium fuel for Mercedes-Benz
The Mercedes recommended fuel for the E280 is 91-octane regular unleaded, while the recommended fuel for the C180 Kompressor is 95- octane premium. While you can safely run the E280 on regular unleaded, and I suspect you could run the Kompressor on 91-ocatane, you will get better performance and economy by running them on the higher-octane fuel. Mercedes-Benz also approves the use of E10 ethanol blend fuel in both of your models, which might help you save a few pennies.
