159 2.4 20007 plate
19,500 DPF/EGR by
AO Silver Member
Join Date: May 2009
Location: United Kingdom
Copper in contact with aluminium isn't a problem until an electrolyte is introduced; that electrolyte is usually salt water. Yes there are now greases like ceramic grease that don't suffer from this. However, many, many mechanics have been using coppaslip sensibly in very thin coats for years without the possible electrolytic effect being a problem.
Many guys here will tell you how often they have struggled to get allow wheels off of hubs that have been assembled "dry" and after a few years that can be a real fight. Clean the surfaces, apply a thin coat of copper grease and it doesn't happen again.
Many others here will also describe how coppaslip has prevented those pesky Brembo pins seizing. My wife's 159 pins were seized solid 4 years ago when the car was three years old and I destroyed the pins getting them out - again assembled dry. The new pins were fitted with a thin smear of coppaslip. On fitting new pads last week (now 4 years later) they were easily removed.
Yes there are better products now that can't suffer the electrolytic reaction like Ceramic grease that you recommend but I have never suffered electrolytic corrosion of any significance caused by using coppaslip.
In theory you are absolutely correct but in practice the levels of corrosion are nothing like the scare stories. I will continue with coppaslip until I need a new tub but I know I will be to old to carry on before I have finished what I have. If I needed a new tub I would probably buy ceramic grease but it isn't anything like the problem that some suggest, and that is from 35 years experience, to make me change now.
Last edited by kandlbarrett; 16-05-15 at 14:39.