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Not in my diesel - but everything else that takes gasoline - Motorcycles, boats, lawn mowers, etc...  


We were going to Ucluelet in an old motorhome back in 2007.  It was running rough as heck, lots of black smoke, and using gas like it was going out of style (440 Chrysler).  Filled it up before the Canadian border and dumped a few cans of Seafoam in it.  By the time we got to the ferry dock at Twassen it was running smooth as silk.  I was sold.  Neighbor here had some injectors in his old Ford Ranger getting plugged up.  I dumped a can of Seafoam in the tank and within half a tank of gas it was running great again.  I also told him to quit putting Safeway gas in it ;)


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What they said ^^


Not to turn this into another fuel additive contest but I am a fan of Howes.  I've used it (when I remember) for years and maybe it's all in my head but I do notice a difference in smoke/haze when I'm using it consistently so I think it's doing something to help clean the injectors a bit.  This was particularly noticeable on my old '89 CTD.  There's no way to know for sure if it's helping with lubricity/pump longevity.

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