Petroleum contracts (whether model form contracts or negotiated contracts) can be relatively formulaic. This can imbue a welcome measures of certainty, and could contribute to the development of an accepted body of custom and practice …, but it can also bring its own dangers. The English courts have recognized a well-known canon of construction that where parties have used language that means one thing in a contract to which they were parties, and they use the same language in another contract, it is likely that the language will have the same meaning. Thus, the wording of any particular petroleum contract should always be considered carefully.
– Peter Roberts, Petroleum Contracts: English Law and Practice (Oxford, 2013), p37.