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What is this engine part? (Getting to know my M54 engine bay)

203370 Views 144 Replies 35 Participants Last post by  Dynamic Entry
Over time, I've come to know (by necessity) almost every large item in the M54 engine bay ... but some items still are unknown to me ...

What is this engine part?

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Been using it for years, how much could really be sucked in and where could it be sucked in from.
Armor All contains silicon. Silicon is deathly to the O2 sensors. Not worth using that stuff and having to worry about it being sucked in somewhere into the airstream going into the engine.
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