M Michaelpk3 New Member Jul 5, 2009 #1 Will it cause harm to the engine if change the oil to Mobile-1 10w40?? The engine is a 4 tec non supercharged, 155HP from a '05 Sportster Last edited by a moderator: Jul 5, 2009
Will it cause harm to the engine if change the oil to Mobile-1 10w40?? The engine is a 4 tec non supercharged, 155HP from a '05 Sportster