while AT MY LOCAL WALMART I NOTICED THAT THE OILS IN THE FIVE QUART JUGS ARE PRICED AT THE FOLLOWING Pennzoil $9.95 quaker state same havoline and castrol gtx $10.95 supertec$7.95motorcraft syn blend$10.95 and supertec Full Synthetic at $13.95 mobil 1 super syn $19.95 and extended performance at $29.95.wouldn't the super tec Full Synthetic be a better deal.would it not be better than regular oil? i will stock up if it is.i have a sonta with a 3.3 v6.