I have a 90 yj, I just got it a couple of months ago, it had 199,000 on it when I bought it. It had terrible blow by so I replaced the pcv and replaced the missing hose that goes to the air filter box. This didn't help much so I replaced the valve cover(after cleaning the old one and then cracking the nice plastic pos).This seemed to help for a little while but now the valve cover is covered with oil again and it is also dripping out of the air filter box. When it is cold it shows about 75psi on the oil pressure gauge and then after it warms up it shows 40 at idle and 75 at 2800 rpms.I haven't tried changing the sending unit or a mechanical gauge yet but it seems like it has so much pressure it blows it out past the grommits on the vc. I am not sure what to do about it, any help would be appreciated, thank you