Since day 1 I have used Mobil 1 5-30 synthetic only. It is very expensive compared to all the other brands but is the most efficient, and that is what Honda recommends.... and who am I to question Honda?? Integra Type R's are designed to use 5-30, and if your using anything else your not treating your Type R the way you should be. However my car does burn alot of this stuff between oil changes... at least 1 quart and a half. This is normal with most B-series motors with significant mileage on them. But most of us who burn alot of oil have our motors modified and are running a little bit hotter, so this is typical. I myself am running very rich at this point in time and once I get the problem fixed I'm sure it won't be as bad a problem once I get the VAFC.