I was cusious as to how many were looking at full synthetic and how many miles between oil changes. I change mine every 5000 and think its just ordinary oil from the dealership.
Unless your dealer is changing the oil in your Vette, Viper, GTR, Porsche, M series BMW or something equally exotic, you're most likely getting plain old (ie cheap) Dino oil - especially at those dealer-special prices designed to get your car into their service dept. At best, you might be getting a synthetic blend. My local Nissan dealer (where my 2 current cars both came from) has now switched from the cheap stuff to a blend. The funny thing is that only 15 years ago, the service department there told me NOT to use synthetic oil, as they didn't recommend it.
A couple decades ago when synthetic lubricants were relatively new, the verdict was still out. Now there is voluminous data to show that it does indeed provide superior lubrication. And though synthetic costs significantly more - $5 (if you shop around) - $7 per quart vs. $1 or less for cheap stuff - oil change intervals can be stretched somewhat by using it. I've had such great engine experiences with synthetic oil, that I even use it now in my mower and snow blower.
I remember 30-40 years ago when automotive oils were so primitive we were strongly advised to change them every 3K miles! Now, even the cheapest stuff will likely be fine even to 5K miles - though I'd certainly never take that chance. Synthetic oil is so good that I've even heard that if you change it at much less than 7K, you're throwing $$ away. Still, with what cars cost these days, spending an extra $20 on oil twice a year is (at least for me) cheap insurance and well worth the extra few bucks. As with most things in life, you get what you pay for. I change the oil in my cars faithfully between 5K and 8K - usually closer to 7K.
Like most things in life, you get what you pay for.