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I have always been curious if these actually do anything and this thread has inspired me to do a bit of testing. I just pulled the intake valves out of a N63 (valves are nearly identical as S63's) with its infamous valves stem seals, going to place the valves in jars of each of the popular valve treatments (Seafoam, CRC, LM, Berryman, Marvel MM, etc) heat it all to 200F, let it sit for 20min, then see what the difference is with the before and after.
While not exactly the same environment of a running engine, it should give us an indication if they actually do anything at all.
All of the treatments and the hotplates to do this are on order and will be here today, will post results within the next day or two for all those Interested.
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