I wouldn't worry about blowing the engine. As long as you bought your used car in a pristine condition with proper care and frequent oil change, I don't think insurance is necessary. A 370z N/A engine blowing up is really rare. It's a solid engine imo. Turbos, on the other hand, can cause your engine to go KA-BOOM! with improper set-up and tune. There are few members here who blew their engines with turbochargers.
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