I finally got around to adding the rev-x and it made a pretty big difference. No idle lope at all and the overdrive stumble is completely gone as well. It still has a little bluish smoke at first thing, cold start up for a minute or two and will smoke a little when I take off after 5-10 minutes of idling. The smoke is gone before I get out of my sub though, less than a half mile of 20MPH running.
I'll probably add another bottle at my next oil change...I plan on going with 5W-40 at that time as well.
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2005 F-250 CC Lariat 6.0L
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