Just for quick reference, the ConocoPhillips synthetic blend brands in the 5W-20, 5w30, and 10W-30 viscosity grades are:
"Conoco All Season Synthetic Blend"
"Kendall GT-1 Synthetic Blend"
"Phillips 66 TropArtic* Synthetic Blend"
"76 Synthetic Blend"
The above are essentially the same product, viscosity grade for grade. So far as I'm aware, ConocoPhillips is the ONLY company to go on record publically (press releases late last year) that their entry-level motor oils are now synthetic blends. ConocoPhillips also blends and bottles "Motorcraft Premium Synthetic Blend" which is also formulated in the same viscosity grades, but distributed by Ford Motor Company. Whether there's any difference between ConocoPhillips' own brands and the Motorcraft brand is subject to debate, but the synthetic blend standardization of these entry-level motor 5W-20 and 5w30 oils occurred in late 2004 (though Motorcraft was touted on the backs of the bottles as using "severely hydro-processed Group III base oils" at least a year earlier in the 5W-20 formulation). The ascension of the 10W-30 viscosity grade to use of Group III base stocks occurred just this past spring. Whatever the status of Motorcraft's formulation differences, if any, all the above have been verbally confirmed as having greater than 50% "synthetic" content with ConocoPhillips CSRs by phone or email by several BITOGers who've bothered to contact the company. Since an email message carries verifiable** source information, I tend to trust its authenticity. In my estimation, for whatever that's worth, I believe the ConocoPhillips brands are the currently incredible bargains in quality motor oil at a buck or slightly more per quart.
*There's only one "c" in "TropArtic" - bad grammar, but spiffy marketing . . .
**OK, an email address can be spoofed if someone's really intent on doing so. But the company would likewise probably be every bit as intent on ferreting out such activity, too.