Mobil Delvac Extreme is formulated with 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, exceptional oxidation stability, and outstanding TBN retention. Mobil Delvac Extreme also provides outstanding resistance to oil consumption, oxidation, corrosive and abrasive wear, and high temperature deposits.
Mobil Delvac Extreme 15W-40 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 is recommended for use in a wide range of heavy-duty applications and operating environments found on- and off-highway, including engines operating under heavy loads.
 Exceptional oxidation stability - Superior performance in extreme conditions and extended ODI service. Excellent soot and viscosity control - Greater engine efficiency, long engine life and long oil life. Excellent oil consumption control - Lower oil costs due to less make-up oil during operation. Outstanding TBN reserves - Corrosion protection and extended drain intervals for both new and old engines using up to 500 ppm sulfur diesel fuel. Low temperature fluidity and pumpability - Formulated for smooth starting in cold weather. Resistance to corrosive and abrasive wear - Long life of critical wear surfaces. Component compatibility - Long gasket and seal life. Meets demanding specifications of key diesel OEMs - One engine oil for mixed diesel fleets. Low ash formulation meeting API CK-4 and CJ-4 requirements - Long emissions aftertreatment life (DPF, DOC and SCR)
Mobil Delvac Extreme 15W-40 engine oil delivers updated high-temperature performance under the extreme operating environments found in the trucking, mining, construction and agricultural industries. Accordingly, this oil meets or exceeds the requirements of API CK-4, CJ-4, CI-4 PLUS, CI-4 and CH-4 service categories, as well as key original equipment manufacturer (OEM) requirements.