welcome to the forum, and i believe you are the first one from singapore here...
youre owners manual should give you the converted amount needed in liters, if not just google it from quarts to liters...
as far as changing the oil to any specific brand, well thats a personal preference, go with what you trust, but any 100% synthetic should be just fine. there is an oil poll here in the forum that would provide good info for you.
good luck, and enjoy the z!
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