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I had the problem also ,found the check valves we're stop up with rust.I pulled all that out,and use two breathers on each side for now.will go to a vacuum pump in the future.Side note I run alcohol and condensation was ending up in the check valves,,,,,,,,



Your breathers were doing the same thing? Pushing out and oil seeping past afterwards?

I doubt it is my check valves, they are only a few months old at best. Are you using the Mopar style breathers like what comes in an pan evac kit, or open air filter style breathers?

Where is the best place to measure vacuum on the engine? I have a strange, unlucky feeling that I am going to need to use a vacuum pump to cure this, but I will try these cheaper fixes first to see what happens.