I would have it changed at @20K if you do not know when the previous owner has the last oil change. Also unless they kept a record you do not know what type of oil they used (for all you know they threw in some cheap gas station oil)
Depending on your driving style and what type of oil you plan on using I would change every 3-5K miles. I would also recommend checking your oil every 1K to make sure you are not burning any oil.
I run Redline 5-30 and change every 5K
Congrats on the Z!
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