Well, I bought it on the same deal last year, then paid a guy $30 to drain the oil, change the filter, fill the engine with dirt because it was a windy day and their bay doors were open. Then, finally fill it up with the oil I brought (there is a place that will perform this service for $15 that I was told about). I will not be doing that again, especially since I know someone with a lift, where we can control the amount and quality of dirt getting into my engine.
cmon! give the poor dude a break. Honestly, the cheapest place where I have found the syn. Mobile 1 is the "Wholesale Canadian Club" on 8th and Preston. They also sell fuel injector cleaner and Gas additive for $2.59