imported post
Sea Foam is designed as a fuel cleaner, originally for marine engines that set for months w/o use. Carbs gunk up, the Sea Foam attacks the varnishes and dissolves them.
The same stuff is approved for use in the crankcase oil, and does the same job there. It dissolves the varnishes/shellac and suspends it in the oil.
When you drain the oil out, it will be blacker than any black oil you've seen before.
When I first got my '94SE I had to do the crankcase treatment twice to get the oil to drain out clean. A new filter each time. After that, because it was a daily driver, it stayed clean.
All this reminds me, time to go ride a bike, it is only 111* outside now.