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the new genuine mercedes benz sealant in a small tube is loctite 5800, get the part number for it. Mercedes Benz have a long list of sealants and some are anerobic - they all come in toothpaste tubes.
The loctite 5800 engine sealant from benz comes in a syringe tube.
if you cant find it get the genuine black toyota sealant from a toyota showroom. Its threebond 1207B