Most oil change instructions say fit a new filter every other oil change.
I use Castol GP 10w-40 and change oil every 4000 miles but I fit a new filter every time believing that is best for the engine. Also I don't really rev my bike and accelerate hard. On a recent shim check it the engine was a clean as a whistle.
It a SV650s K2 with 29,800 miles on it and I have just realised I Have doubled the mileage since buying it 18 monthes ago.
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