I just received a parts order which contained spark plugs (Bosch super plus, plus Yttrium). These have the same PN as the old plugs with a "+" at the end, assumed to signify the Yttrium electrode. Question, is it OK to use these in our cars that call for the FR8DPP33 or is this going to be another issue like the "platinum" plugs issue is? Are the dealers selling the Yttrium plugs at their parts counters?

__________________
Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz