I went to walmart today, the back way, through the auto section, much eaiser. anyway I ask the techs there what bottle oil is most requested. He said Castrol GTX and Valvoline. They run Pennzoil thru the lines. we got to talking about the board and stuff, and I asked about Quakerstate. Get this. This guy said, and I quote. " I TALK PEOPLE OUT OF USING QUAKERSTATE OILS"/ Now what does that tell you. Either there are still a lot of people that still believe that "Myth". or there is somthing to it. Im sorry. But you have to admit, there isn't much as far as an additive package to their oil. GUM UP GUM UP GUM UP..... GO AHEAD GUYS, BLAST AWAY. WHAT I REALLY WANT TO KNOW FOR THOSE WHO DEFEND THIS OIL, WHO AND HOW MANY ARE USING QUAKERSTATE OIL???? Plese come out of the closet. I knew I wasn't wrong always using Castrol in all my other cars...But I never kept one past 70,000 until now. Im really having a problem deciding what to do for summer. Shaffers 10/30 or 15w40. OR Delvac 1300. Pretty cheap stuff. And I really like the TBN of these 15w40 oils. Question is, do I really need a 15w40 for summer or just stick with 1030. I burn NO oil at 140,000 miles.