Most of these oils that say fully synthetic, havoline, shell, zic, total (quartz 9000 for eg), mobil 1 etc etc, these are not true pao iv oils but a blend having group iii oils as base stock. Email these companies and they can offer some clarification on it.
In europe there are stricter reglulations where they are not allowed to call these same blended oils as fully syntehic, thus its semi - so liqui moly labels it as semi synthetic. Its all the same.
And all these so called shop 'experts' who say you can go 10k+ on more expensive oils, on what basis are they saying this? Unless you get an oil analysis done on your oil, changing oil based on how costly it is, is just rubbish.