Thankfully my Wife works far enough away to vacate the dilution. We just bought our '18 in mid November. I drove it to work for five days in a row. I checked and the oil level rose about 1/8". I made an appointment about it but my wife drove the car to work one day before. The level had dropped to almost normal and was told to just drive and enjoy the car. I will not drive it to work more than a day at a set and will do early oil changes.