I was looking through my manual today and ran across the Dexos specification for oil. I have used Quaker State oil for years so I went to their website to see if their oil has the Dexos specs. Unless I'm reading it wrong it looks like only their synthetic oil has the Dexos specs. Is this true of all brands? There was also mention on one of the websites that an oil with the API starburst symbol would also work in place of the Dexos spec. Could someone enlighten me?