Chevron Delo XLE SB 3G 15W40: A Smart Choice for Your Engine- A synthetic blend oil that offers longer oil life better wear protection and longer engine life for on-highway and off-highway vehicles. Chevron Delo XLE SB 3G 15W40 (2 Pack 6 Quart Smart Change Boxes) Delo 400 XLE SB SAE 15W-40 with ISOSYN Advanced Technology. The Next Generation of Heavy Duty Engine Oil Chemistry - engineered to deliver longer oil life better wear protection and longer engine life. Delo 400 XLE SB SAE 15W-40 with ISOSYN Advanced Technology provides the same level of protection you expect from an SAE 15W-40 but in a synthetic blend heavy-duty engine oil. It is specifically formulated for on-highway applications including 2017 Greenhouse (GHG 17) compliant diesel engines with lower CO2 emissions in addition to 2010 compliant low emission and off-highway Tier IV diesel engines with Selective Catalytic Reduction (SCR) Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR) systems calling for SAE 15W-40 premium h