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Delvac 1 in CI4+ form is hard to find in the US, most of it is now Delvac 1 ESP which is CJ4. John Deere +50 15W40 is a great CI4+ oil, with P>1400ppm if you like ZDDP.
There is also an excellent additive to "soup up" CJ4 oil, called Redline Breakin Additive. It has 20000ppm Zn and 17000ppm P, also 20000ppm Ca (I think it's detergent/antacid).
It needs to be used carefully. In a 15 qt pan 1/2 bottle will raise Zn and Ca by 300 ppm, P by 260ppm. Since CJ4 oils are defined as <1200ppm P, most are ~1000-1100, this is about right.
Raising the Ca level by 300 will raise TBN by ~1.0 if it is indeed Ca sulfonate or phenate detergent.
Charlie
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diesel Landcruiser & M37; 05 Unimog U500 w/Unicat camper
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