I hear that but it’s the same problem I had before the rebuild. Just don’t want to cause any damage to internal metal by running thinned out oil. To me I just smell the gas but the oil doesn’t really look to thin. Wondering If I should put a bandaid on the problemm for now and run a heavier oil just incase there is gas getting in some how. Maybe 20w-40. Either that or I can get a different petcock. During the rebuild I had the tank off with the petcock still attached to the tank in the off position and it never leaked.