Cam lobe discoloration normal?

318willrun said

Once the cam is broken in, 1200 ppm of Zinc is plenty fine with a stock or mild spring pressure street cam.

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I think that's a fair statement. In fact, I'll go further. IMO, once broken in and a good wear pattern established, any good synthetic "should" have enough ZDDP to do the job. It's at break in that it's critical to have extra ZDDP.