Lucas Response To Zinc Additive

i've never ever looked for any oil that had a high ZDDP (zinc & phosphorus) content. broken in cams with whatever oil, wallmart/castrol/mix and match/ etc. never had a cam failior. i've said this before. run killer springs on a street engine.. expect a lobe to go, also, running engines low on oil/ going 1,2k past oil change time/ not changing oil filters/ etc. 30 years of doing this and i call tell you that your oil will fail you if you neglect it. high ZDDP content or not. since the first dinasaur croked up until the mid 1990's the oil was 100 worse then what it is today. wheres the millions and millions of cam failiors do to the lack of ZDDP? you know, do to the fact that probably half of the people out there buy the cheapest oil they can get. including me. for the record, this is jmo.