Mobil Delvac Extreme FE 10W-30 is a synthetic, high-performance diesel engine oil that helps extend engine life while providing long drain capability for modern diesel engines operating in extreme conditions. It meets or exceeds the new API FA-4 specification for fuel-efficient engine oils, as well as key original equipment manufacturer (OEM) requirements.
Mobil Delvac Extreme FE is formulated with a blend of synthetic basestocks and a boosted additive system tailored to deliver extended performance for up to two times beyond OEM recommended oil drain intervals. The proprietary formulation delivers excellent wear protection, unsurpassed oxidation stability, and outstanding TBN retention. Mobil Delvac Extreme FE also provides outstanding resistance to oil consumption, oxidation, corrosive and abrasive wear, and high temperature deposits.
 Mobil Delvac Extreme FE 10W-30 is a synthetic, high-performance diesel engine oil. Formulated for use in the latest heavy duty diesel engines operating in extreme applications, where API FA-4 is recommended by the engine builder/OEM. Engines equipped with exhaust aftertreatment systems. On-highway applications operating in both high speed/high load and short haul pick-up/delivery. Sold as a case of (4) 1 gallon jugs. Should only be used where an API FA-4 oil is recommended by the OEM. Boosted formulation provides:  Potential to improve fuel economy Exceptional oxidation stability Excellent soot and viscosity control.