[Canuck_Targa]

I suggest reading the above linked article "Selection of the Right Motor oil for the Corvair".
This is a very informative article that is dealing directly with the reduction in Zddp in the newer oil. This articele will give you enough information to make your own decision on what oil is right for you and your driving climate and conditions. It is based on facts and studies not opinions and opinions of others. Not saying there isnt alot of factual information in the previous 83 pages of this thread, but there is definately alot of opinion based on what, I am not sure.

I will base my decision on what my driving type and climate is, a race motor in the southern U.S should not be using the same oil as a car that gets out once a week for a sunday drive in a far clloer climate.

Read the article and you will be able to see what you should be looking for in an oil.