Pablo is more correct on this one. Very unlikely that synthetic oil "in general" can cause oil consumption problems. Now some synthetics that tend to run thin or shear quickly, might be another matter. GM installed sythetic oil in the newer Vette's for one reason, to avoid the cost of additional oil cooling or an external air/oil cooler. It was cheaper and would actually fit under the hood, and would not detract from cooling system capacity. If my car came with synthetic, I would STICK to synthetic. I have written on this board about engine design and oil consumption becoming more common, mostly learning from a GM powerplant engineer, it's not the oil in most cases. Don't drive your car like grandma, keep the carbon out of it, and stick to manufacturers specs on oil, and your oil consumption should decrease. keep in mind that a truck engine is a whole other story, completely different service.