ernied, with all do respect, im not saying oil companies would do that, but if you think companies in general wouldnt do that to protect their reputations, you must not watch tv or realize what walmart and other discount stores manage to pull off with companies to "drive prices down". im just asking a question about oil and i only used mobil for an example. nearly all the 5 quart jugs at walmart have their logo on them and even say something about returning your used oil to walmart for recycling. it is more than possible that walmart is getting a sub par product in a like package, they are very known to do so. doitmyself is giving a specific example in his reply. i worked selling outdoor poer equipment for years, we once recieved a few troy-bilt pushmowers meant to go to lowes (when they first started selling them), the mowers had a lowes sticker on them, a couple days later our rep personally came and picked up the mowers meant for lowes and gave us our correct mowers and appologized saying that the mowers meant for lowes were a lesser grade than those sold to dealers. i later went to lowes to see for myself, and you could visually see differences if you knew what to look for. so oh yes discount stores most definately do in some cases get a lower quality product. and i want to know if thats the case with oil? so far ive seen a reply with a link to the Mobil 1 sight asnering that question, and im sure mobil or any other company would not say yes we give a sub par product to certain retailers. i want to know if anyone has any experience, seen a test, something to that nature?