As long as whatever product you're using meets the manufacturer specifications (API/SAE etc.) then they can't void your warranty unless they SPECIFICALLY mention certain products, which they can't of course as that get's them into anti-trust legal territory.
Everyone knows I'm a big Mobil-1 nut but keep in mind that there are only two true synthetics currently available: Mobil-1 and Amsoil. Since there's no regulatory requirements for the sale of synthetic or synthetic blend lubricants, the marketers can make all the claims they want as long as there's at least something like 1 part-per-million of synthetic material in the product. Food for thought. Mobil-1 (and Amsoil to a lesser degree) has an impressive and proven track record since 1975 (XRN 1669 - SAE Paper 750376) in aerospace, marine, professional racing, industrial, commercial, agricultural and extreme enviroments. Royal Purple just has a website and colorful adverts. But hey, if it makes ya feel good...
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