A nearby Superstore is having a clearence sale, and they've got 19 quarts of the older SL rated M1 15w50 for $4.04 per quart, 50 percent off the old price of 8.09. I already bought 6 quarts of GC earlier today so I don't need any more right now but I just might pick up one or two quarts if it's a good deal. What do you think?