Gentelmen

I have seen many posts recomending not to use Bosh Platinum 4 plugs. But most of these were in response to people having trouble with getting there engine started or rough idel ect. I have been using Bosch Platinum 4 plugs in my 1988 560SL for about 5000 miles now and so far it starts and runs well. Since I put these plugs in the car as soon as I got it I have nothing to compare it to. I went to the platinum because it was a newer technology than what was available in 1988 and they work so well as standard equipment in both my Fords where I change plugs at 60,000 miles wether they need it or not. So far the Fords never really needed the plugs to be changed at the 60,000 mile interval. All I can say is that Bosch platinum 4 plugs do not make my car hard to start or idel rough. But I cant really say anythigh good or bad about them. So what are the issues. Does anyone have any real A to B comparisons of plug usage with real good fully functioning vehicals.

I do know plugs can make a difference. In the early 80's I found that there was a noticable difference in the idel charicteristics of Toyota's with Nipondenso vs champion plugs. Nipondenso being noticably smoother.

Also aside from platinum 4's what about straight platinum. My car calls for a Bosch W9DC0. I have currently installed 4479's, What about W9DP's.


John Roncallo