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    BX owners using Rotella T5 or 6

    Does anyone know why the BX23s manual says Do Not use oil that is API rated CJ4? I know that Rotell T5 & 6 are rated CJ4. CJ4 is intended for diesels with exhaust particulate filters. What can it hurt using CJ4 rated oil in the BX? Can it void your warranty if you do?