Moto Guzzi 1100 Breva uses a Bosch 3330 oil filter as standard. The bike only gets about 4000 miles a year. I would like to use the best filter for the job considering build quality and fine filtration capabilities. This bike is a long term keeper so a few extra bucks on a filter isn't going to break the bank. Right now the best filter I know of is Amsoil, but there may be better choices.