will copper crush washers react with the metal of the transmission?

[Hendog]

Local supplier had copper crusch washers to fit the G50 plugs. What is the tranmission housing made of and will the metals react adversely?

[Steve@Rennsport]

Hi:

The housing is aluminum and the copper washers are totally inert. No worries, sir.

[randywebb]

The two different metals will generate a tiny emf that will slightly increase corrosion over time. You could measure this in a lab, but the effect is nil for a car. It might be a problem if you were building a space probe of something that needs to wake up centuries hence...