"Before you drop $1,200 on one of those, check out
http://www.infinityaerospace.com/index.html . He has preoilers for less than
$400."

I have to comment on this statement, as it doesn't tell the whole story.

I have an Oilamatic pre-oiler on my ES and have had zero problems with it.
I use it to lubricate the engine before every cold start.  I also looked at
the Infinity pump, which I would consider of comparable quality, BUT...  The
Oilamatic is designed for aircraft and comes with ALL of the switches,
relays and fittings needed to install it except for the hoses.  Unless
they've changed since I shopped for a preoiler,  Infinity sells you a pump
and nothing else.  Oilamatic's installation instructions are very thorough
and were easy to understand.  They've been around for quite awhile and are
STC'd for several certified installations.  I believe when I got mine there
may have been a lower price for experimental installations (but don't hold
me to that).  I paid $859 for mine two years ago.  I know there was a price
increase after I bought it.
  The preoilers Infinity sells are a fairly new item for them (within the
past two years) and the pumps are from marine applications.  I believe
they're only sold for experimental installations.  They should work fine,
but just be aware that you'll have to spend a chunk of change on hardware to
get it installed, so the $400 vs $1200 is an apples to oranges comparison.
Just be sure to do your homework so you know what you're getting for your
money.

Skip Slater
N540ES