The issue is not that Synthetic is better. everyone knows that it is. The issue is if it is needed. Most car owners don't envision having their cars for over 100K Miles, yet a good diet of cheap walmart oil will make a Nissan engine last 200 K Miles easily. Synthetic oil is a luxury, not a necessity, especially with todays oils. It's OK to love your car, just keep things rational.
Also, synthetic oils in the differentials is a different story.
CD