I am a big fan of Mobil 1. I think it has proven itself time and time again. It is so a cheapest synthetic oil out there because it knows how to market its products. For example, Walmart has a 5 quarts containment for 19.99. With a monthly coupon, that can come down to 15 dollars per 5 quarts, which are more than most car need. Mobil 1 last about 10k miles are city driving and about 20k miles for highway driving. There is also more miles than most people put on their car anyway. Therefore, it comes down to one oil change annually. For 15 bucks, a peace of mind is insured for year. If that is not cheap insurance, I don't know what is.
The best winter protection oil I found up to date is Chevron full synthetic. This oil has a pour point of -76. That is pretty good. Even the best Mobil 1 only has pour point of -65 and I am not it is still avaiable since I can't find it. The new SuperSyn from Mobil 1 has a pour point of -54, but it is formulated to last longer. There is a Mobil 1 0W20 for cars from Honda and Ford, which recommend 5W20. 5W30 synthetic oil still has much better flow than regular 5W20, but now we can have 0W20 full synthetic. I know Honda is notorious for making their engine super tight. I doubt Ford does the same, but it is trying to make its overall gas mileage lower since its SUV lineup are notorious at consumming gas.
I went to an auto shop yesterday. Actually I go there twice a week looking at stuffs because it is my hobby. While there, I saw many people looking at oil and pick those cheap regular oil. I wanted to tell them to just pick Mobil 1 full synthetic to try out and I'll give cover them for the difference. I am not an oil dealer and don't want to be. I just think changing oil at 3k miles is a waste of resource, time, and money. Yes, people actually waste a lot of money changing their oil at 3k because it cost money to pump gas to drive to the store to buy more oil or to the shop to have the work done. Full synthetic oil last at least 10k miles and only cost twice as much. That is a very good trade off.
Seriousness aside, I have a joke for you guys. It has been told that even a used synthetic at least 4 times longer when used as heating fuel. Yes Sir, you can pour those used sythetic oil in your oil tank to heat your home for winter at fraction of the cost.
Mobil 1 is the way to go 
