Never trusted the stealership to do any work in my Z unless they will allow me to physically present while they do the job.
Given the fact that your oil is that low it doesn't matter whether you put in a synthetic or non-synthetic what is more important now is to top it up immediately to the required level otherwise suffer the consequences of a blown engine.
I personally use a synthetic oil. Never had my oil go down that much I do have an oil cooler and I drive the Z hard most of the time.
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