My only cost will be the oil. The filter, the labor, the environmental fee... all of that is covered in the free lifetime oil change. The only thing that isn't is 0W-20 oil. So, my "free" oil change will cost approximately $20 in oil that I will bring with me, instead of $28 in oil that I buy from them, or up to $50+ for a fully synthetic oil change from someplace else around here.