Blue corrosion of coil packs?

[repo]

One of them looks fine but the other 2 have this blue corrosion on the cap connector. I noticed it last time I did the plugs/wires and cleaned it off with some emory cloth and baking soda, but then forgot about it. It seems to have come back. I tested them all with a multimeter and they are ok, and the truck runs ok.

Should they be replaced? Can I put that red battery grease or something like that on them?

 

[Doc2012]

That’s what happens to copper when it corrodes.

Clean it, put some dielectric grease on it, and go from there.


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[repo]

That’s what happens to copper when it corrodes.

Clean it, put some dielectric grease on it, and go from there.

You think it's just from moisture getting in there then, not an electrical thing?

 

[sbryan]

Get some of this https://www.amazon.com/BOESHIELD-Corrosion-Protection-Waterproof-Lubrication/dp/B001447PEK/ref=sr_1_1?ie=UTF8&qid=1525030527&sr=8-1&keywords=boeshield+t9 and spray it on the coil packs and forget about them.