I've been reading a lot of the info here and at other sites. This is by far one of the best oil related sites I've found. That being said, I've decided to switch over to syn oil. I have a 1998 Lincoln Continental with 85,000 miles on it. I drive about 30, mostly highway, miles round trip to work. Plus some around town driving for errands etc. I'm looking to save some time and money by switching. Currently I use Mobil Clean 5000 and change it every 5000 miles. Which is about every 8 months. I'd like to extend the OIC to 10,000 so the cost of the oil is cheaper per mile and I save time by not having to change as much. So my question is what oil do you think is best? It has to be readily available at most retail outlets. It seems a lot of people like the Mobil 1 high milage formula. What do you think?