Diesel Additive

Back in October I had a problem with my '92 E300D (180,000km 110,000m). My car stalled on the road. Had the problem fixed by a diesel injection system
specialist. The O-rings in the fuel succioning mechanism (dont know the name of this part) were replaced, air was sucked and the fuel would not go in the engine, that I understood.
After I asked him if an additive would prevent such a problem, this guy recommended Stanadyne, Performance Formula to be added in the tank. I've been adding this product since, and I figure that there is a fuel economy that more than covers the cost of the product.
Anyone use it, or know the product?
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Stanadyne is one of the biggest and most respected manufacturers of OEM diesel fuel injection components so if they market a product which will complement their hardware then it is bound to be good. Either that or it is a profit opportunity too good to miss ;-)
Huw
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