the 55Y00's and change your oil on a regular basis, and you should be A-OK. I change my oil and filter every 2k-2.5k miles. Say it's unneccessary all you want, but it's ONLY $25 per change. A fair price for all the good it does, and a drop in the bucket when compared to the money most of us shell out on mods and etc. for our Z's.