As far as oil goes, oil is oil. I've worked in car service for over 10 years (I've worked at a Nissan dealer as well) and the difference between full synthetic and regular oil is price and what it's made of. If you're doing your services on time, it really makes no difference between synthetic oil or regular oil. Sure there has scientific evidence showing synthetic takes longer to break down, but what does it matter if it's changed at the correct intervals?
If you're trying to make your car last longer than your previous one, the cheapest and most effective way of doing so is completing your services on time!. For the transmission service, my advice would be to take it to a professional and have a flush done. Draining and refilling at your mileage does little to nothing if you've been slacking on maintenance. Another side note is the transmission fluid must be at a proper temp to get the fluid level correct.
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