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So I have made a psi tester and ran in cab. Released pressure to install and then started up the road at 160 degrees with oil never going over 12 degrees hotter than coolant. The guage didn't move till a few minutes of normal driving and was barely moving. As soon as I started getting on it and gaining boost up at highway speeds it gradually just climbed to 17 psi where then it stopped and I was unable to detect further cause of the degas cap. The reason I tested was cause my cap was having blow by. People told me to replace the cap and I had one on the way but I couldn't wait since I could put together this test kit at local auto parts store within 20 minutes and 20 dollars later. The egr and oil cooler were replaced 25,000 miles ago. The former owner I suppose had issues at that point with over heating. Hmmm, Did he blow a head gasket then? Ford wanted to go in replace this then tell him he had gasket leak later? He sold the vehicle to his nephew and now after 20,000 miles his nephew sold it to me. I had ford do the degrees temp test before I bough the vehicle but obviuosly that wasn't enough. At this point I'm thinking this guy got me. Does this sound like head gaskets to you all? Again temperatures never go over 12 degrees on oil but most of the time with normal driving stay 8 to 10. I haven't had any issues with overheating but tested since I see blow by on the degas cap. Please any further advice or thoughts would be helpful. I'm guessing head gaskets but would like to be sure prior to spending thousands. Next question is how bad is it to baby it while its like this? Am I hurting it worse? Thanks in advance. I"m new to this forum but have read so many valuable threads.
 

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In process of repairing a 6.0 with blow gaskets. It built 10+ psi of pressure within 5 minutes of starting after sitting overnight. Also smoking pretty good. I would suspect the cap.
 

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I would try a cap first, as 1 psi over cap pressure as measured is well within the possible inaccuracy of your gauge. I've seen the degas bottles themselves become distorted at the flange, causing venting issues as well. You can use a sanding block and fine paper to check the flange. Use a magic marker to mark the sealing area, then lightly sand. Low spots will still have marker on them after a light sand, high spots will be bare plastic.
 
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