Well everyone, let's see if we can start something here...

What is the downside (if any) to using the additive Prolong in my MB engine(s)? It sounds like a good thing, beneficial without any apparent downside.
Does anyone have any bad experience with Prolong (in particular)? I've seen their "info-mercial" and it sounds like a great product.

We have an '89 300E with 100K miles and a '92 190E 2.3 with 168K miles on it and I'm interested in extending the engine life as much as possible.

let's hear what you have to say!!!

Thanks in advance for the wise and passionate discussion that is sure to follow...

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Jay Yambrovich
1989 300 E
1992 190-E 2.3