Synthetics bring out leaks? Never heard that before. I switched to Mobil 1 and have had nothing but great success (thanks to you guys for advising me there). Good luck figuring this one out. Oh, btw, I managed to lock up my left rear caliper. I hear that happens all the time on 93-94 LS's. Once I got the sucker heated up, I just flicked my emergency break on and off and fixed the prob. I cant use my E-Brake anymore until i get it fixed. 
PeMiL
PeMiL