For those saying there is no galvanic issue…snip
I don’t think that anyone is saying that. IME of both steel and aluminium frames, with components in a variety of materials, copper grease doesn’t cause a noticeable problem. I don’t own a carbon frame so can’t comment on that
Molyslip (makers of Copaslip) specifically make Alumslip to avoid using copper in joints involving aluminium and steel.
I’m all for a one-pot solution. When my 1.1lb (500 new-fangled grams) tub of copper grease runs out then I’ll buy ceramic, as recommended by RNP ^^
In practice you won’t see a seizing problem as the galvanic issue eats the aluminium……
IME, no visible damage to threads, etc. Just clean the old copper grease out and replace once or twice a year
Slightly different circumstances, but here is my steerer starting to get galvanically eaten in 2-3 years due to the presence of steel, aluminium, water and copper.
The key ingredient here is water, which is the electrolyte that allowed galvanic corrosion to take place. Grease will keep it out