I had bosch platinum for the last 30000km and they totally sucked... I bought from walmart a nice set of Champion Platinum Power for less than 10 canadian $ and they are really nice, I really saw the difference, I can now screech tires in 2nd.
stick with this rule:
- bosch`s are made for euro car
- ngk`s are made for japaneese car
- champion`s are made for detroit iron (or aluminum