Sounds like a Gallery gasket issue. My HR nismo (2007) went at 35K miles. I was lucky to catch it because of the factory oil pressure gauge.
How and when they go really depends on the driving habits. Heat cycles with high pressure (high reving)... the paper gasket eventually starts to absorb oil and then eventually break apart.
Someone that just daily drives versus someone that likes to bounce off the rev limiter, or tracking the car are some of these habits i'm talking about.
I just pulled a buddies 2012 370z engine out (manufactured in 2011) due to gallery gaskets. He purchased it at 30K miles. I put a scope down and gallery gaskets were great. Oil pressure normal. After 10K miles... boom. Tossed a rod. He increased the rev limiter to 8K and was only a matter of time. And yeah... he loved bouncing off limiter.
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