Button Near Gas Cap?
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Although I am a diesel noob myself, I cannot comment on your first question. However, I can say for the latter question that it was probably cheaper for Mercedes to make one part for all of their models instead of making one specific part for gasoline and one for diesel models (since Europe and other markets have both gas and diesel models) in an effort to keep costs down. Also I would not be surprised if that part is shared with the GLS & others.
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jdhoang (06-23-2021)
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jdhoang (06-23-2021)
#7
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FYSA — DEF is an additive used in modern Diesel engines to reduce emissions. So on the 350d you have a second cap where that blank is, and that is where you add the DEF.
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jdhoang (06-23-2021)