Honda genuine oil is also Caltax Havoline Motor Oil. Only its packed in Honda's branded gallon. I have 2004 Exi and change oil anywhere between 3000 and 5000... there is a considerable improvement in performace with Havoline Formula. If you're in Islambad, you can get precise quantity from F-6 Caltex as they have Oil available in Barrels so its cheaper than buying a 4 ltr gallon