The only way to know is to monitor that oil level yourself. I watched mine like a hawk after I bought the car (with only 12K miles!), thinking the odds of getting a bad motor were pretty slim. It was fine at first but eventually ended up using 1 quart in 600 miles, so it was pretty clear something was up. Took it…

Short block replacement under warranty here for my G35. What issues has your Z had?

I spoke with the director of the Indianapolis Motor Speedway Museum and they're going to be selling their W196. I didn't think to ask if they were going to auction it or not.