According to Mobil's website, the EP is API certified:
" Does the Mobil 1 Extended Performance meet GF-4 specifications? How did the new specification impact the development of the high-endurance product line?  Mobil 1 Extended Performance contains an extra performance additive to help deliver exceptional performance and protection. This fully synthetic technology is designed specifically for longer service intervals. Appropriate viscosities of Mobil 1 Extended Performance also meet all the requirements for GF-4. Additionally, they exceed the requirements of API SL/CF and various ACEA (European) specifications. (Updated March 2006)
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Original owner 1998 100, OME 865, OME shocks, Borla, Jaos bull bar, PIAA 520's ATP and IC. Also have a Bimmer for the commute and canyon thrashing but that's for a different forum...
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