Yes, that's right. 1200 ppm is the sweet spot for street cars where the oil might stay in the sump for months or longer. The ZDDP can become acidic over time and consume the base additive meant to counteract acids that occur as byproducts of combustion. Excessive amounts of ZDDP have been shown to cause pitting and spalling on engine parts. That's why some high content ZDDP racing oils will say "not for passenger car use" on the label. If you mis-use the product, any damage is your fault not the manufacturer's.
