now that's a lot of ZDDP

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It might be good to mix with your favorite oil to boost ZDDP. I'll stick to the RL Break in Oil Additive if I need a ZDDP boost.
 
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Since we are on the subject of lots of ZDDP here, what exactly do you want high levels for? I have seen bits and pieces of information on ZDDP for flat-tappet engines, but what exactly is it's purpose (I have seen it is really only good to have high levels on the flat-tappet engines)?
 
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 Originally Posted By: roushstage2
Since we are on the subject of lots of ZDDP here, what exactly do you want high levels for? I have seen bits and pieces of information on ZDDP for flat-tappet engines, but what exactly is it's purpose (I have seen it is really only good to have high levels on the flat-tappet engines)?
ZDDP is a sacrificial AW agent. It also benefit other areas of the engine as well. Bearings and cyl walls IIRC. It forms a surface like a whisker, and gives some added protection. AD
 
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