The basic message is that prior to about 1960 there was little or no ZDDP in most oil when it was added for high performance engines. Most newer oils (through SM anyway) still have more ZDDP than was added at that time for the high performance engines. It is just another version of the gasoline lead additive nonsense all over again.
Non-detergent oils don't have any ZDDP. I've seen a lot of sludged up engines that still had good camshafts.
If you want more technical details, follow the links in the above referenced article. You can find more details using a web search or looking on oil company's sites for their listed additives or MSDSs.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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