<< I've got a feeling that unless you work for a major Castrol customer, this is a dead one.
Great oil though... >>
Castrol is crap oil. Syntec is not even truly synthetic. It's made of the same base stock that most companies are NOT passing off as "synthetic", and charge only 1/3 as much for it as Castrol charges for Syntec. They're a bunch of sleazeballs.
Maybe coincidental, but I HAD been running Castrol "GTX" motor oil in my car for many years. My gf has an identical car, very close in mileage, and has been running cheap-o generic Wal-Mart SuperTech motor oil. In the past year, my car developed low oil pressure problems. Hmmmm.