Sorry for the late response but I was looking around and came across your thread. I have been using the Rev-X for about a month and a half and I definitely notice a big difference when I first start my truck in the morning. It's much smoother and doesn't have that rough idle except for just a few seconds. However, the weather hasn't gotten cold yet so I guess the real test will be this winter. It's expensive, about $70 per treatment. For what its worth at this point I will add it again at my next oil change. There are some videos on YouTube with people doing before and after cold starts, check em out.
2004 F350 Crew Cab Long Bed Dually KR
1997 Expedition - Eddie Bauer (wife's)
1996 Mustang GT Convt.
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote.
I was experiencing very poor performance before the engine reached normal operating temperature (stumbling, missing, jerking, etc); from what I have read, I seem to have had the same symptoms as what is referred to as "stiction" in regards to the injectors. I have 170K miles on the truck, I put in two bottles of the Rev X after an oil change and now the truck runs great. I was very skeptical at first, regarding how I could fix this problem by simply adding something to the oil, but I have been very pleased with the results. I don't claim to be a chemical engineer or even fully understand what this stuff does, but I have no regrets paying the $70 for it.
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