I have the Bosch Plat 4's for a while. They are awesome for about 6 months they aren't that great anymore.

I went with the NGK Iridiums. I take my plugs out every so often to look them over. This is what my number 4 cylinder plug look like. So after seeing this, I bought some cheap NGK coppers and change them every year.



What can you expect for being hyrolocked once already. Its only my beater for to and from work and college.