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Hi Cub community, I have a '75 Cub 1000, cast iron Kohler motor. I've read things both for and against switching to synthetic oil, however I'd like to get some input from this forum. Cases for and against are both appreciated as I'm trying to make a decision to stick with conventional oil or go synthetic. I have zero problems with the motor, so yes, I'm hesitant to change. However, if it will truly benefit the motor and extend its life, I will switch. I only want the best for my Cub! Thanks!