Join Date: Jan 2011
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You will get hundreds of different answers to this question. I have a 5.7 and use 5w20 conventional. Some switch to full synthetic after break in period. With the quality of today's oil I do not see the need to do so when I compare price vs. performance. I would recommend you do a search and research the threads and make your decision then.
The only thing I would suggest is that you do the change yourself if at all possible. There are many horror stories about quick lube joints: scratched pain, door dings, and even not replacing the drain plug. Plus unless you buy the oil, take it to them, and watch them pour it in you really don't know what type of oil they are putting in your beloved engine.