Acceptable is when you can remove the oil fill cap and you don't see individual "puffs" of crankcase vapors.
The pressure of the vapors should not be enough to lift the cap off of the filler tube when placed upside down. It may vibrate off of the filler tube, but it shouldn't be blown off.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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