Re: Synthetic or not…Oil question of the week Home › Forum › Ask A Member › Synthetic or not…Oil question of the week › Re: Synthetic or not…Oil question of the week amullerReplies: 1055Topics: 163 July 21, 2018 at 10:18 pm #79859 I would use the oil you have at 24:1. When that’s used up try some synthetic and see if you think it smokes less or has other advantages.