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Stanadyne Performance Formula is the only additive used and endorsed by Volkswagen for use in the TDI, and the only fuel additive recommended by VW for use in the '09 Clean Diesel.
Link to official VW bulletin
Diesel fuel quality is declining throughout the world, and the trend is expected to continue. In fact, a recent survey suggests that 70% of diesel fuel sold at service stations does not meet the Society of Automotive Engineers (SAE) standard for diesel fuel lubricity. Low sulfur or "dry" fuel has become an expensive problem for diesel owners. This issue can be addressed by using a quality fuel additive such as Stanadyne's Performance Formula, which helps protect against excessive wear and corrosion while increasing both power and fuel economy. Performance Formula also helps prevent diesel fuel gelling in cold weather.
While low lubricity has become a major problem with today's diesel fuels, moisture is still the greatest enemy of any diesel system. Be wary of certain additives which claim to "remove water". In fact, they dissolve the water, which eventually will pass through the filter and attack the injection components. Stanadyne additives demulsify the water, pulling it out of solution so your filter/ water separator can more effectively remove it.
Due to its flammable nature, Stanadyne additive can only be shipped by UPS ground service and cannot be exported.