SeaFoam is, from what I've heard from a talk show car fixit friend of mine, a
mixture of one of the good alcohols as well as some petroleum solvents and
maybe more.  Whatever is in it it does well in the fuel side of the system
dissolving carbon and hydrocarbon deposits and binding h2o without titrating
out.  It also seems to work well as a just before end of oil change additive.

Put in what is appropriate based on how far your down on the dipstick you are
plus OK to use excess capacity your system can handle (research your oil
system).

I don't know what is allowable on a 1.9 waterboxer, so if I was to use any oil
system solvent I would look at the dipstick and then drain a bit of oil if
needed to make room for what the solvent maker suggests is appropriate.

Whew!  Way too long.

I use it before an oil change every 25K or so, and use it in the suck-it-
through-the-vacuum-line carbon dissolver mode about every 50K.

I've been using SeaFoam for a couple decades (+) and seen no issues and some
apparent good.  Which is a pretty meaningless sample of one from a biased user.

tom

On 19 May 2011 at 21:28, Edward Maglott wrote:

> My ol wasserboxer has its share of lifter noise.  Especially as I
> reach the end of the 3000 mile oil change interval using castrol
> 20w50 and mahle filters.  I was wondering, as I approach the next oil
> change in a few hundred miles, if I might add something to the oil to
> help clean the engine internals a bit without causing trouble.  I've
> heard SeaFoam and Marvel Mystery Oil mentioned on this list in the
> past.  any recommendations?  I'm thinking a one time treatment here.
>
> Thanks,
> Edward
>