TnLex

Are you sure that you don't have a leaking valve cover gasket? I just don't see how the PCV valve/hose would have a drastic affect on a rear main leak (but it could sure change the leak rate on the rear valve cover gasket). Glad your leak went away though! :)

AM - FM - Tape - CD buttons are lit with radio off. Pressing a button selects that mode and turns the stereo on. -

Does the fluid feel/smell like oil or transmission fluid? From your description it sounds more like oil to me. Being on the right side (near the oil filter and alternator) it could be 1.) residual oil from a recent oil change since it's impossible to change the filter without some spillage over the engine mount, 2.) the filter gasket, 3.) a valve cover leak, 4.) a camshaft or crank seal. Like blk_on_blk suggested, you may have to clean everything up and keep a close eye on things to pinpoint the leak, -

Bought my '99 ES300 with 160k miles on it 3 weeks ago for $3500. It's a 2 owner car in excellent shape. The previous owner had a Lexus dealer replace the transmission 30k miles ago and they replaced the charcoal canister a couple of months back. I replaced the valve cover gaskets last week resolving a pretty bad oil leak. This car drives great and was a very good deal for the price paid.