Do you run high RPM's?
I do and after about 1,000 - 2,000 miles or so the front seals start to leak. It's just a thing with the 2.0's (in my case). the 2.3's dont do it so bad though.
I think it has something to do with to much preasssure in the crank case causing them to blow back out. if higher speeds are ran, then it is just that it is getting extrememly warm and wearing it down. think of how much friction it has to have.
then again I could be alll wrong. I will solve it eventually.