Castrol, Daf and MAN have warned truck operators against trying to save fuel and money by using “magic” oil additives. Castrol technical manager Brian Utton says: "Any increase or decrease in the level of a single additive or the introduction of a new additive [to a lubricant] can affect the stability of the formulation. This is especially true in terms of wear and deposit protection."

 

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http://www.roadtransport.com/Articles/2009/01/29/132892/castrol-says-oil-additives-may-harm-warranties.html