No, Harley-Davidson oil filters are not all the same size. The size and specifications of the oil filters can vary depending on the specific model and year of the Harley-Davidson motorcycle.
Harley-Davidson produces a range of motorcycles with different engine sizes and configurations. Each model may have its own unique requirements for the oil filter. The size, shape, and compatibility of the oil filters can differ based on factors such as the engine displacement, oil flow rate, and mounting location.
When purchasing an oil filter for your Harley-Davidson motorcycle, it is important to refer to the manufacturer's guidelines and specifications provided in the owner's manual or consult with a reputable dealer or mechanic. They can help you identify the correct oil filter size and type that is compatible with your specific Harley-Davidson model and year.