| I have to confess that in all the years I've done my own oil changes (since 1976) I have only changed the washer once - and that was when there was a small leak. I've never found it a problem, but I was recently berated by an engineer for not changing the washer. I figure if it don;t leak it must be doing it's job.
With regard to copper vs ally - provided it's soft enough to compress and seal I don't suppose it matters. |