Sulfur is is not a good lubricant. In fact, it's too caustic for most engine metals. Zinc, in the form of ZDDP is best for resisting cam spalling. Some of the 'high mileage' or 'vintage car' oils have ZDDP levels of 1100 or 1200ppm, and are good for flat tappet and roller tappet cams, where the spring pressure is significant.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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