the tesco's own brands have the additives added in the tanker and not very precisely. Shell and BP is mixed under strict conditions and very precisely. I know which one I'd trust.
Congratulations to Chris 'I on becoming a moderator.
With the ever increasing growth of the forum we thought it was a good opportunity to add another Moderator to the team. So well done Chris 'I. I hope the members will be gentle with you.