Another vote for the Amsoil. I've had mine for about 3 months now - check it about once a month, and do the 'white glove' test on the intake - no a speck of dust or grime.

The filter minder has barely moved since install, whereas with the stock paper one I would have the minder pulled halfway down after the first couple of romps on the go pedal.

I do seem to hear a (very) little bit more turbo whine, but well within acceptable levels.