Texaco are not an upstream supplier, they are downstream only. The parent company is Valero in San Antonio, Texas. Valero sold all the rigs and finding/drilling equipment some time ago and now just concentrate on being a supplier to both retail and commercial customers. They have just invested heavily in reopening the Manchester fuel terminal and the fuel comes by pipe from the Pembroke refinery in Wales.
When a tanker driver loads at a terminal he enters a code into the loading rig that tells the rig the amount of fuel he requires and if he is supplying Shell, Esso, BP, Texaco etc etc. So for Shell he might load 30000 litres of ul95 and then the system adds a squirt off V Power or for Esso a squirt of Tigers or Tesco a squirt of momentum, all fuel is exactly the same its only the additives that differ.
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