I've attached my oil analysis report (they got the vehicle type wrong, it's the PHEV model, but that doesn't affect the analysis) which was taken at 3714 miles. As you can see, fuel dilution was already at the maximum level allowed. Fuel in the oil is a really bad thing, it prevents oil from properly lubricating the ICE. Fuel in the oil is a common problem in PHEVs because the ICE tends to not run long enough to burn off the blow-by, so instead of burning off, the fuel in the oil builds up. This oil needs to be removed from my PHEV soon, and I will remove it at 5k miles.