I haven't used Seafoam but my mechanics at the Honda dealership where I  work
do recommend it.  I have used Marvel Mystery Oil and ran it for 1000  miles
in the crankcase before an oil change. I normally use Mobil 1 for 6,000  miles
and replace the filter (Mann/Mahle) every 3,000 miles. I was surprised to  see
the color of the old oil that came out of the engine after running the
Marvel Mystery Oil-much darker than after any other oil change. It did quiet the
engine's lifters somewhat and no oil leaks developed from possibly removing
some  of the sludge. It had been 60k since my rebuild with nothing but Mobil 1
after  engine break in. I am assuming that the sludge was old from engine oil
passages  that were inaccessible or components that were not replaced or cleaned
during  the rebuild. There was discussion of other worthwhile additives for
the fuel  system. I had previously used only Techroline (Chevron product) and
had been  fairly satisfied that it did what it claimed to do. My best results
were with a  product (line of products) that is available at many auto
dealerships in my  area. It is from a company called "BG" and is the fuel injection
service. It is  a two part cleaning. An additive that goes in to the tank and a
aerosol from a  liquid that is delivered via compressed air to the intake at
the throttle body.  I added this myself at the dealership followed by a manual
cleaning with a brush  to remove any stuborn carbon deposits. My idle smoothed
out and dropped 50-75  rpm's. I do not think that there was any significant
build up of deposits in my  case as I believe in using a good quality, name
brand fuel with a good amount of  detergents. I have seen, all too often, the
problems caused by cheap gas  (clogged injectors, dirty plenum and throttle body
and clogged EGR ports).  Really, the savings on cheap gas is short term in
most cases when you factor the  lost fuel economy and repairs/maintenance that
you will face in the long  term.

David Clarkson
90 Westy (237k)

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