Can someone educate me on what makes an additive package good? I have heard often here this or that oil has a strong/robust/excellent additive package and would like to know just what makes one additive package better than another
That can really depend on the lubricant manufacturer. One may use high levels of Moly and Calcium while another may use high levels of other additives. It's the final blend that counts. The best way to determine if a oil has a strong/robust/excellent additive package is to look at UOA's. Oils with robust additive packages tend to last longer and show lower levels of wear metals.
Thanks Arkapigdiesel, but that really doesn't help me figure this out. I can assume by what everyone is using here must be good oil, but I am trying to better understand these additive packages. Like the oil you are using...Redline. In my limit knowledge that is one good synthetic oil. But I don't have a clue if its additive package is any better than any other synthetic oil.
Search out Bruce381 posts with tidbits from a practicing formulator, and Terry's posts as an analyzer w/ an extensive library of analysis.
You will quickly see that there are a majority of additives that will never show up in simple analysis. From what i see, synthetic oils exacerbate this, since they can use more compounds that are not organo-metallic in nature hence do not show up in basic analysis.
Looking at PDS is just first step in choosing a new lube, looking at tests and certifications the lube has passed is another, and looking at wear results and experiences of other users in similar engines-environs is another.
Your question is very good and basic. The answer becomes very complicated very quickly.
Certainly there are a lot of technical aspects that go along with making a good additive package, many of which I'm likely to never know being I'm certainly no chemist. Those articles linked above are great reading and should really help you understand more about how the oil works.
For all practical purposes, a good additive package is one that shows good UOA's and keeps the engine happy and healthy for a long time. Most oils that have less respectable additive packages show poor UOA's.