Button Near Gas Cap?
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Joined: Oct 2002
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From: Northern VA
2021 GLE 450
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From: Florida (727)
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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Joined: Feb 2020
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From: Northern Va
2014 E63s
it is a blank spot on non-diesel vehicles, but on diesel equipped models, that would be an opening where the Diesel Exhaust Fluid (DEF) is added.
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Joined: Jan 2020
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From: Fredericksburg, VA
2020 Mercedes GLE350 4Matic; 2023 Tesla Model Y
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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