Just saw this on YouTube. Its an advert for Shell motor oil. They built a clear plastic 370Z with a plastic engine so you could see the oil inside the engine. This explains how they built the car.

cool video

Incredible technology. It's nice to see that they used a Z to advertise the oil.

They might have chosen the z because of all the bad press around old consumption issues with the later model z's. Owners tend to look to use the best oil they can to avoid the problem.