They are not platinum. They are Bosch 4 head copper plugs.
BTW, now after my car started running fine I have to crank it for about 5-10 seconds for it to start.

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1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
Sold:
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.