I tried to look up the maintenance schedule, but I couldn't find anything. But synthetic usually lasts much longer than regular oil, and going by Steve's schedule there, you're looking at one oil change every 10-12 months or so. A regular oil change is $30-40, every three months/5000km, so in the same span of time you can spend $90-$120 and take your car in three-four times (which can be a PITA), or you can take it in once for the same price.
People who complain about the cost of synthetic often forget that the change intervals are much longer than with conventional oil... the cost does even out.