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, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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