I installed bosch plugs in my first Bonneville the day after I bought it..aka the day before i signed up here
3 months, the car had a bad idle, and a bit of a miss, i changed the plugs over to the cheapy AC delco OEMs, problem solved. Mind you the car ran excellent after I installed the Bosch plugs, i would of just assumed they would of lasted more than 3months/3000kms lol.
From what I have seen other members on this club deal with when it comes to bosch over my last 2.5 years, I have seen they haven't proven to be really good in our application. I stay away now, 02 sensors are either Delco, or NTK (divison of NGK), same with plugs, NGK, AC Delco, and autolite.
Damien-they don't make them like this anymore
97 SSEi. 3.2mps,msd,optima,1.9 YTs,245 RE750s,SLP Headers,custom ported SC inlet/outlet, 180 deg, INTENSE pcm,42.5#injectors,255lph pump,custom soilid motor mount, 3.0 mps(maybe), and the nut behind the wheel.