I changed the oil in the Kohler generator before my last trip and ran it 79 hours last week.I don't know if this is normal for others but I have a small amount of blow-by that is on the floor below the generator,I had not noticed this before.I burned .85 of a gallon per hour average,and the weather was 65-90 degrees during the week.I don't think that anything is wrong but just checking if others notice the same small amount of blow-by as I have.The oil level on the stick might have moved down 1/16-1/8 of an inch so consumption I think is OK.Even though Joe does not like it I am using Rotella 15-50.