Two cars, two questions, please:
230E 92, W124: After I (imprudently) used a valve cleaning product in the fuel tank, the car starts to lost power specially on hills and hesitates painfully when accelerating. Sometimes it stalls when idleing. I also incidentally changed the fuel´s octane for a higher one at the same time. I dismounted the fuel filter and it was very dirty. I cleaned it as much as I could and reinstalled it. Car went well for a while, then same deal. I dismounted again the filter and it was dirty again. The cleaning product seems to have removed or diluted some kind of tank´s sediment. Is the solution to change the fuel filter, or I will end up with a new filter clogged? Which other thing would you suggest to do?E240 98, W210: During a recent travel I changed the engine oil in a non dealer shop. The electronic dashboard now shows permanently the "exceeded" alert and the "tool" figure asking for service. I have tried many times the procedure listed in the car´s manual to clear the message, but it doesn´t work. Is there anything else that I can do to reset it?
I will appreciete your suggestions. MMansilla