no matter how tight the oil filler cap is.. the damn thing just leaks oil from it. im really not sure what else to do but its anoying as hell. i was also getting a lot of leakage from the the center bolts, as well as the PCV.. it was only happening on the driver side.. the passenger side is fine.. i put black RTV gasket maker under the washers on the center bolts and that seamed to work for them... but what about the damn filler cap? any idea's?

 

I get a few drops- over time you can see where it starts to run down the side of the cover. How much oil are we talking in your case?

 

well after whiping it clean.. then driving for about 30min.. there is a smearing (if you call it that) of oil coming from the cap.. and as we all know.. oil spreads out, so like 1/2 an ounce maybe.. its really pissing me off. i mean i guess i could use some gasket maker and use some on the threads of the valve cover.. but thats not what i really want to do.

 

Have you tried just replacing the cap, or the gasket on it?.. worked fine for me.

 

I had a check engine light on when I bought my car this summer. The owner said it was a bad O2 sensor so I replaced it, this did not clear the problem. I also had oil leaking from the oil filler cap and the PCV grommet. I bought a new grommet from my local dealer, and I cut a bicycle tube to fit tight on the oil filler cap. No mor oil leak and check engine light was gone.

 

oil likes to leak from the dipstick on mine..and sometimes it shows up on the valve covers...idk where its coming from...maybe the bolts to the v covers?..w/e..im gunna change them soon anyway.

 

I would assume it has something to do with the crankcase pressure, so something with the PCV system. With the car idling, pull the PCV valve out of the valvecover and put your thumb over the hole to feel for vacuum. If there is no vacuum then it means either that valve is broken, or there is a problem with the lines on either side, or a problem with the throttle body passages, or the PCV filter. If all of those check out, it could also be something to do with the valvecover gasket. Its also possible it could be caused by aftermarket parts related to the oil system, but to be honest I wouldnt know any specifics about that. I know some people run a breather instead of a PCV valve. This is how my 91Z28 is setup (breather), but I've heard its not a good idea to run breathers on both valvecovers.

 

the circle track racing stock car guys that race around hear all use breathers. why are they not a good idea?

 

Here's a good thread with alot of info:

https://www.thirdgen.org/techbb2/sho...&highlight=PCV

I personally have not experienced any problems with my Z28 with breathers on both sides (and its boosting), but I'll admit alot of that stuff in that thread makes sense. Its definately something for me to consider.

 

Don't even think about using a breather on a MAF setup.

O.K. - Think about it then. Maybe you'll understand why I made that original statement. You can get by with it on a speed/density setup, like the later TPI and TBI engines. MAFless MPFIs might get away with it too, but not with a MAF. Just look at the plumbing.

 

after reading that hellalong threat crazyhawaiian posted i will say that the fuelfilter in the pcv system seems like the best idea. second best would be a catch can.

 

Are you saying that because the MAF monitors the amount of air and expects a certain amount to go through the crankcase through that hose on the Throttle Body which using a breather would require you to plug the lines? Beucase I ran a breather on my MAF car without any problems at all. The tuning may have been off, but I couldn't tell.

 

My car was pooping oil out the dipstick tube ...PCV holes , etc . A month later I spun a bearing .