I only asked because the last time I bought plugs at the dealer they sold me plain Bosch plugs - nothing special about them (No M-B PN or star on them - same box as every parts store sells). The only difference between them and the ones I could buy at Pep-Boys was the 2X price. That is why I ordered these from Phil, because they were $4 a piece cheaper than the M-B parts counter charges (for 16 plugs that is $64).

But, I wondered if Bosch is making the standard plugs for M-B and selling the yttrium plugs aftermarket now or would the plugs I get from the dealer still be exactly the same as these (with yttirum).

I guess wanted to avoid installing them all (16 of them!) and then finding a problem and being told...oh, you used the yttrium plugs! M-B only recommends "normal" plus plugs and having to do the whole job over again - as I did one time when I used platinum + plugs and was told that was verbotten despite Bosch's assertion they are a direct replacement.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz