I ride a 03 stock busa with 18,000 miles on it and I've had it for about 4 years. All I've used is Suzuki Conventional Oil 10W40 with a Suzuki oil filter. I'm thinking about switching over to Shell Rotella-T Ful Synthetic oil 5W-40 with a motorcycle Fram oil filter. The cost would be $25 vice $35 for the Suzuki stuff. I would still change my oil & filter about every 2,000 miles. I think the engine would be better protected with the Synthetic oil and myabe shift a little easier. Can anybody tell me why I should not change over to the Synthetic/Fram oil/filter? Has anybody had a bad experiance with this Shell/Fram combination?