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First thing I need to know is which of the metals are aluminum or magnesium.
Is the block aluminum or magnesium?

I’m experiencing non structural pitting and a white powdery ash on the alloy bits scattered around the engine bay including the engine block especially the timing chain cover.

I’m up in Toronto and they use a new leathal sticky spray salt with calcium. It’s possible that some corrosive residue is remaining after winter.

As an aside i’m Getting the underside and engine bay passively sprayed with crown rustproofing (no holes drilled ). Is it worth it to spray some rust paint on the control arms first?
 

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The new methods of pre salting and solution spraying can rot out any metal. I've been using the lanolin based undercoating spray. Pressure wash everything, then check out the video on YouTube and stop the oxidizing.

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