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I think that creating negative pressue in the crankcase helps prevents seals such as the rear main seal from leaking. I had a lot of trouble with that before running a PCV. Breathers on the valve covers didn't get it. I'm talking a Windsor, so maybe it's a different story with an FE.
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After a good hard ride.....oil pressure is over 50, temp is below 190, she idles and no new dents. LIFE IS GOOD!
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