On my '91 Vanagon GL Campmobile, I have an oil drip from the oil
pressure relief valve screw port.  A mechanic here advised me that I
should have him replace the entire valve for a substantial price.  The
port has recently been opened and the valve checked when I thought I was
having oil pressure problems (not, I had oil pressure monitoring
problem), and the valve was found to be good.  I doubt it needs
replaced.

I should be able easily to fix the leak myself -- right?  Should I just
drain the oil, take out the port screw, and replace the gasket on that
screw?  Is the gasket a crushable gasket like on the oil drain plug, an
o-ring, or what?  What tool do I use on the port screw, just a big flat
head screw driver?  I assume the valve will not be disturbed by this
procedure.  Do I assume correctly?  If it will be disturbed, I'll have
someone do it, but not the guy who wants to replace the entire valve.

Thanks, Dave Mc