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In Reply to: Bosch +4 Plugs posted by Jim Eagan on October 29, 2000 at 22:19:07:
I have used the Bosch +4 plugs in my 944S Porsche and I liked them. That said, I just replaced the plugs in my 528e last week with new WR9LS Bosch Silvers. They are not the cheapest plugs either, almost as much as +4's but I do have to say that the car runs great with them and I am not the least bit sorry about using the "manufacturer specified" plug. I really came close to buying the +4's but in the end, I went Silver. By the way, there is no way I would ever, repeat ever, buy a regular Bosch Platnum again for anything I own.
Hope this is of some help.
Mike
87 528e