I have just done a major job on my Audi diesel which involved sump and crank seal housing off.I used the genuine VAG sealer which is dear at best part of £20 for a toothpaste sized tube, but there was plenty in that for a 2.0l sump and seal carrier, i applied it sparingly- a 2-3mm bead all round and not a sign of a leak 2000 miles later so it must be good stuff.Its the same as VW Audi use in the factory,- and the last thing they want is warranty claims for oil leaks so it stands to reason that its good gear! I intend to use it all eventually on my bike cases as needed, there`s plenty left.Bob.