Royal Purple - zinc

Royal Purple motor oils - all of them - are fully "API certified" (unlike Amsoil), which means there is NO zinc or ZDDP in the oil that would be bad
for catalytic converters. That is a specific requirement for API certification.
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That doesn't mean it doesn't perform to those levels, but for warranty purposes, this is not an API certified product. To be fair, some Amsoil products are API certified and they do have the correct labelling, but their top-tier products do not. The issue of fake API labelling and non-compliance has caused such a stir at Amsoil that they had to put an entire page up on their site dedicated to answering this particular question. You can find it here. Basically what it boils down to is money. Amsoil don't want to pay the $300,000 it can cost for an API certification of a single oil formulation, and getting API certification can limit them to single vendors for some of the raw products they use. If those vendors put their prices up or go out of business, Amsoil need to either pass the increase in price on to the consumer, or go through the whole API thing again from scratch. http://www.carbibles.com/engineoil_bible.html
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Midlant wrote:

Thats been their excuse for years and its hogwash. There are scores of oil companies out each with new formulas every year and they all pay for API certification. Why won't Amsoil? Having API certification would be a selling point. They'd make back their investment just like so many other oil companies out there. Amsoil is hiding something. Money isn't the issue.
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Exactly. Amsoil and their pushers have been saying this crap for years - they always have an answer why they are not API certified. Yet - everywhere you find a discussion of oils, or someone asks about oils, some Amsoil pusher will push his sales pitch and denigrate othwer oils that DO meet API specs. Anyone using non-spec oil in their vehicle is a nitwit - kiss your warranty goodbye.
Amsoli currently has ONE product that meets API specs. If they can do one - why not their major product?
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