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Is it likely the extra oil messed up the oxygen sensors? I don't think so; not in a few days' worth of driving if the O2's were healthy to begin with. It is true that if engine oil has been overfilled, more of it will make its way to the exhaust where it will encounter the O2 sensors, causing them to foul, but the abuse would have to be over a longer ...


1

According to this Wiki article, all of the 320d's are 2L engines. BMW shows them to be 1995cc.


3

With BMW's it used to be that the last two numbers represented the engine size. Sadly on newer cars this seems to have been abandoned so it is no longer a valid way to tell. You'll have to do some research based not only on the model but also the year the car was manufactured. This information is generally available in publications such as Parkers or ...



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