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(More customer reviews)From an expert: Don't use any oil additives whatsoever, NONE of them are effective and many are damaging. Simply use a good quality oil, its got all the additives you need.
Everybody and their brother has some sort of miracle oil additive that promises to add horsepower, recondition your engine, increase fuel economy, and protect your engine from anything and everything. Listen to that claim, it even sounds like they're selling snake oil! Unfortunately they are. Prolong, Slick50, Duralube, zMax, etc have all been sued by the FTC for deceptive product marketing, as they have all been tested and none actually showed the benefits they tout. In some cases, the oil additives were actually more harmful for the engine then using oil alone. What about zMax? Nothing more then tinted mineral oil. How can this be? There are absolutely no standards or regulations governing the safety or effectiveness of oil additives. Oil additives fall into four categories: pure snake oil, PTFE, Zinc dialkyldithiophosphate, and detergent-based. The snake oil category are simply those products that are a complete sham, like zMax, Slick50 and Prolong. Do your research.....
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