Salim (may Allah have mercy on him) says that Sayyiduna Ibn Umar (may Allah be pleased with them both) considered making a condition in Hajj to be disliked, and he used to say: "Is the Sunnah of your Prophet (peace and blessings of Allah be upon him) not sufficient for you? For he did not make any condition either."
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4881