[Formulajones]

Yeah Jay, oil is always a weird subject with people. Someone on the internet always says this or that is better yet almost no one even sends off a sample to see what their oil is doing.

I will say this, plenty of oil testing done with very expensive equipment that has shown too little and too much zddp can be harmful. What's the right amount? Only an oil analysis will tell you what your engine likes.
The other thing to watch for is the lighter weight oils. Another weird subject with people that isn't cut and dry. Everyone wants a lightweight oil but you have to be careful as the API ratings don't allow as much zddp in these 5-30 and 10-30 oils. Some have more than others but the API puts a cap on the amount allowed in the light weight oils, some dont even have 700 ppm. Not to mention the zddp today is different than it was just 15 years ago as several regulations were passed to make it more compliant with cat converters, but that's another subject.

How much do you want? Again you need an oil analysis to tell you that, every engine is a bit different.