I was wondering if the oil that Name brand quick oils put in, is the same oil you buy, just in bulk or a cheaper third grade stuff, not even avaiable to the public. I think I read on here about Mobil wanting extra for Mobil 5000, when that is their cheapest oil in stores. We get our company trucks oil changed at Texeco quick lubes and I noticed on the bill that it says Havoline T36 oil 10w30. I took for granted they used Havoline Deposit shield, now Iam not so sure. I know alot of Dealerships get their oil from Carquest or Napa bulk by the drum and then just tell you its Valvoline. Which it is ,Sort of. Anybody know what the story is.