Seafoam
BTW, isn't "race fuel" leaded?
I had my C32 repaired few weeks back with the cylinder head taken off. at 96k miles the internals are still very clean.
I would be somewhat cautious about using this on a Benz and you might just think about a good shot of Techron Cleaner every few thousand miles instead, as that is the a product endorsed by MB. If I was going to use an internal cleaner on my Benz, it would be a milder product like BGK 44 and not Seafoam. Too harsh.







