Shop Harley Oil Coolers › K&P Oil Filter (required for all M8 touring bikes) K&P Oil Filter (required for all M8 touring bikes) from $159.00 The K&P oil filter is required for install on all Harley-Davidson Milwaukee 8 models. The K&P oil filter is required for install on all Harley-Davidson Milwaukee 8 models. Material: Select Material Black Aluminum Quantity: Add To Cart Added!