After upgrading from the m103 2.6 to the 3.0, which engine should you now purchase for? Ex: the 2.6 plugs were H9DC vs the 3.0 plugs W7DC. The only thing that I swapped out on the 3.0 were the rocker arms, valve springs, and cam shaft as the 3.0 engine I used was from the 103.981 engine that did not have the upgraded rocker arms and cam shaft, so the original lobes were pretty much flattened and deeply grooved.

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1990 190E 3.0L