NGK BCPR5E-N-11 are perfectly fine for a standard motor, and if you're looking at platinium plugs, then go for NGK BCPR5EP-11. Don't have to use NGKs, but they are most commonly available. I use NGKs and Champions. If you want to go a heat range colder, the subsitute the '5' for a '6'. Don't really recommend it though.