Originally Posted by Snertz
All fine and dandy here. If the piece is made out of aluminium, I see no reason why it would be coated. I mean, the entire oil filter housing is non-coated aluminium. Also, not trying to be a prick here, but hard anodizing is not that durable as people think it is.
So I ask again: why coat something that is made out of metal which is constantly submerged in oil? "