That's lots of hours for a Fred Flinstone, cast iron block typical Malubu, Incorrect Craft, or Mastercash. Not a lot of hours for a toyota, only 2.25 oil changes vs 11 for one of the others (heretofore known as "Brand X")
Water is seeping from either your shaft seal (easily adjusted) or possibly your speedo system (check the brass tubes in the trunk)
or from a leak in your ballast system. (empty it, isolate it with the hand valve and drive around to see if you are still taking on water)
See the how to page for pics, if you do some work and you have a digital camera take pics and I'll put them up. The more pics of Epics of all stripes we have the better this site will be for everyone.
Check your bilge pump to verify it was wired correctly, if it turns on with water in the bilge and pumps out, it's working. Lots of them were wired backwards from the factory. I replaced mine, I think I posted pics or I will soon when I return from beautiful Texarkana, Tex.