I've heard that Brad Penn is not rated by the API. Is that correct? If so, is that good? Regards, Bob Helt In a message dated 1/4/2012 11:09:12 A.M. US Mountain Standard Time, jay.pitchford at gmail.com writes: Brad Penn oil has plenty of ZDDP in it for sliding friction > surfaces like camshaft to lifter and fuel pump rod to eccentric.