I have assembled several engines using permatex/loctite/napa sealers and the last two engines using the MB stuff. The MB stuff is expensive but it seems to be much better than anything else I have ever used. All the engines assembled with the MB approved sealant are bone dry - the permatex assembled engines "weep" a little bit. I suspect Larry Bible is correct - its important to make sure you have the correct sealant for the job but the MB stuff seems to work everywhere I have tried it.

How much is it worth to you to have a leak free engine ?? $20 seems pretty cheap.