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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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