NGK's???

i ve been usin the ngks lately cuz the peopl are rigth the platinum fours area waste of money and they are bs plugs.. so if i wass t o stick to the NGKs and i race here and there when should i change em often/?...when i used the platinum 4 ss they sucked cock cuz after 3 months ther were nasty lookin oppinions?

recommended and actual change dates are so off par is rediculous. i pretty much change mine when the center electrode starts to become encrusted in crap. i actually recommend the ngk copper's, copper is a better conductor then platinum, only downside is they dont last long. a lot of f/i people i know use them but they have to change them every 10,000.