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Patman- I'm planning on doing a UOA with every oil change I do. Right now, I'm using Chevron Supreme 10W/30 and an OEM filter (Nissan part 15208-65F00). I plan on using this combination for a while and then maybe switching to a synthetic sometime down the road.

Although this is my first oil analysis, I figured I'd trend the whole life of the of the car. So here is the oil analysis for an '04 350Z, with the 5W/30 (so says Blackstone) that came from the factory, during the break-in period.