CJ is a diesel standard. By itself it does NOTHING to benefit our cars over API spec. The Rotella T CI-4 Plus had the most ZDDP and excellent performance specs...CJ-4 has virtually none. I also have a nice stock of Rotella T CJ-4 that I missed the new cert on. CJ-4 is widely being slammed as not worthy for engine preservation. If you have this, add STP Oil Treatment. (My earlier post referenced CJ-3, um...that's a model of Jeep, not an oil spec. It WAS CI-4, CI-4+)
