My oil filler tube just started leaking and I hold Malcolm to blame.  My
van never put a drop of oil on my driveway until his post. ;)

So...What's involved with this?  I do have all the pieces in place.  It
appears to be leaking where the plastic meets metal.  Does this piece
just slip on?  And is there a seal that can be replaced or do I need the
whole piece?

Thanks,
Darren