Mine are also very loud. I have tried all the suggestions on the board but nothing had worked longer than a day for me. I do know that anything above 10w30 weight oil tends to agrevate the situation. These have been suggested to me:

1)Flush Engine & Change Oil
(made mine louder & more consistant but I was changing over to synthetic and didn't know 15w40 would also make it louder... another flush and 10w30 quieted it down a little)

2)Run Car @ 4,500rpm For About 10 Minutes To Get Valves To Rotate and Clean Off.
(quiet about a day - don't work anymore)

3)Drop The Oil Pan and Change The O-rings on The Pick up Tube as Well as The 2 By The Oil Filter.
(quiet again for only a day - made ticking intermittant instead of constant)

4)Pull The Oil Pump and Replace all the gaskets and seals.
(this is my last shot... I haven't done it yet and plan on it when I do my timing belt. I've been told that there is a seal that can let some air in and to look for some sludge around the bottom of the pump... which I have.)

Good luck... these are about all you can do.
It's probably a mix of #3 & #4 although the other two are good for regular maintenance.

-J
--
'94 855 5spd 'Drew' My E-Bay Ride 202,000 Miles