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http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Racing_Oils.aspx It seems these are "fully-additived" like a street oil but with as much ZDDP as would benefit the motor, not considering the cats or such. If the offered viscosities (and price!) seem right for you, this might be a good...

Hi all. I know this smells funny, but tell me where. If I have a car that has a 5-qt oil capacity, and burns 1 qt/1000 miles, and I keep it topped off, adding a 1/2 qt every 500 miles, I'm already essentially changing the oil every 5000 miles, right? If I use a high-enough quality oil for a...