So, I am curious about what effect (if any) the "age" of the oil has on the well being of the engine. From reading this thread it appears some folks change the oil in their machine(s), say fall and spring, regardless of how many miles/kilometers traveled. Why?? Unless the machine is driven only short distances that do not allow it to become fully up to operational temperatures, I fail to see a difference between that and driving the recommended distances between oil changes. Comments??