Hi, I have read this before but didn't have an answer, but recently I had a slight ingress of fuel into the crankcase, which can and does happen to direct fuel injected turbo engines. So I had my oil analysed in a laboratory and all was ok but was advised that the silicone levels were slightly raised.
Which basically is dust and were raised to 28 parts per million and that normally is around 20 parts per million and attention to the engines air filter was advised. I had read that a dirty engine air filter would cause the engine to run rich.
I had the engine filter checked by my local Honda Dealership by one of the technicians and I was present when he checked it, and had quite a lot of dust in it. So a new one was put in there and then. So I believe this was the reason why the engine was running rich and eventually the rich petrol will wash the oil off the bores and find its way into the crankcase. The ingress of oil was only slight. It also proves that an oil analysis will show things up well before problems can arise. It's worth noting that if the filter gets very bad it will trigger the indicator on the dash. I don't know when the filter was last checked, but one things for sure I will get it checked at every service to ensure the engine gets the correct amount of air it requires for a correct air/fuel mixture.
Regards Fred.