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aluminiun corrosion



dear fred,
               My experience with 10 year old vw/ audi/bmw cars has been that 
the aluminium heads show much more corrosion  than the aluminiun 
radiators . I figure that the electrolysis sets up between the nearest 
electrodes (alum head to iron block) and this is why the radiator does not 
corrode as severely as the heads.
 
sincerely,
  
henri baccouche