You can add Rev-X at any time. If you're about to change the oil, I'd wait. If you've still got a couple thousand miles to go, you can go ahead and add two bottles now.
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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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