Some of us are planning on keeping the Z's for a little longer than 3-4 years. Like.... Forever.
Also, engine technology has evolved since those days as well. Yes, regular oil will still lubricate fine on a regular basis, but synthetic is better and tougher. And lasts longer.
It's like comparing a honda civic vs a lamborghini. Both have four wheels and get from A to B. But one is just way better than another.
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