This is a very good question for owners of vehicles that are reported to be more susceptible to sticking ring packs. You need to make a few assumptions first to even consider that there MAY be an advantage to using synthetics. Assumption #1: GM's story about several of it's engines (ie saturn, caddy) use oil due to stuck rings. In reality, this is not limited to GM engines, they're just the only ones that I've heard the story from. Assumtion #2: The stuck rings are caused by high temps in the ring area due to engines designed for high fuel mileage/low emissions and the placement of the rings higher up on the (minimally sized)piston skirts. Assumption #3: That the VII's in non-recommended (wide viscosity range) dino based lubricants are the REAL culprit in sticking the rings. Yes, carbon in a way, but carbon from the polymer based VII's burning in that high temp area. Soooo, If you can believe all that, and I know some don't, and a synthetic oil, due to it's nature, requires NO or very little VII's..then I would say there is an advantage to using synthetics. And this actually goes against GM's recommendation to use dino in most cases to keep cost per mile down. I hate to keep bringing this up, but can anyone say which oil has the least VII's in it? Wouldn't it be a parameter to consider when choosing an oil for a specific engine? Shouldn't it get at least an honorable mention in an oil analysis or on the side of the oil bottle?