The fast lube places are very lazy, ever single time I brought my '00 V6 2.8 to get oil change, they always forget or loose the special screws that hold the bottom splash guard to the car. Each screw is $5 -$10 at the dealer. Most places ask if you've ever been there before, if you havent, its extra work to remove the bottom, or it takes a special filter thus, $20 bux extra. Its all B/S. Oh, i forgot, the car takes 5.5 quarts, and they advertise up to 5quarts, that extra 1/2 quart will cost you $4.00 bulk oil. I decided to DIY and avoid all the petty crap.
Synthentic isnt needed, but it extends the OCI. I'm about to switch to synthentic after a RX treatment and flush. I doubt theres much of a difference, but I wont be due to a change until thansgiving. I have a small valve gasket leak that creates a smell, I wonder if burning synthetic smells any different?