I was just thinking about these while at AAP...an it got me thinking: Would one of these even worth getting one for my Cobalt? I know that they do work well for bigger engines, but what about for a small engine like the ecotec? Would I see any benefit? For right now, the car does more city driving than freeway. The oiling does make me wonder, but I think you don't have to put too much on in the first place... Opinions?