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I am seeing the same thing. I have a 2016 eHybrid and the thought for this model is that the oil doesn't get hot enough long enough and there is gas drainage since the engine is on and off. I notice the overfill warning when the temps are below freezing. We had a warm spell earlier this week and the overfill lamp wnent out. Oil was changed in December. But I have onlly had the Cayenne for six weeks. Starting to wish I had picked up a 2016 Diesel instead of the eHybrid.