I have seen many posts about this over the past year and I dont get the spend twice as much on oil thing. I have 3 Zuks all get the cheap stuff at what ever quick lube I happen to stop at, and inbetween the 4-5000 miles I usually wait to change it again, it gets the cheep stuff from the gas station.
The result:
89 Kick Purchased with 60,000 miles, now has over 200,000 miles and still running strong (never rebuilt)
97 Tracker Purchased with 90,000 miles, Drove it to 130,000 miles and now it a parts truck for the 89 and motor is still running great.(never rebuilt)
98 X-90  Bought with around 60,000 miles, now has 120,000 still running great (my 1000 miles a week commute vehicle)(never rebuilt)
Usually I believe in the "you get what you pay for" and I know there have been test out there to "Proove" the synthetics are better, but I'm sticking with the cheep stuff.
Zig