If you guys ever see one of the early British oil filters, they looked like a roll of toilet paper, and somehow they worked. Probably explains one of the reasons the British cars engines failed so early, usually under 100k, and my 240 z went 180k. My Datsun had a spin on filter, and guess what filter I used? Fram orange! When I worked on motorcycles a few years back, we stocked Fram, but with the brand new big bore high performance bikes like Suzuki Hayabusa, and top Hondas, I would stop by dealership and pick up Oem filter. That was on recommendation of people that knew. Their comment was that the Fram didn't have a drain back valve. Being these were first 600 mile services, I didn't want to chance anything. But who knows, without doing one bike with a Fram and the other with a Suzuki filter, and tearing into filter and motor, checking for wear, and debris in filter, we just had to go by faith.
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