SAE 15W-30 LUBRICATING OIL COMPOSITION HAVING IMPROVED OXIDATIVE STABILITY

摘要

We provide a SAE 15W-30 lubricating oil, comprising: a Group II base oil having a KV at 100°C from 5.0 to 8.0 mm2/s; a second Group II base oil having a KV at 100°C from 10 to 14 mm2/s; a DI additive package designed to meet API CJ-4; and 0.50 to 4.95 wt % viscosity modifier; wherein the lubricating oil has a TBN from 8.55 to 11.00 and provides an Induction Time in a CMOT from 270 to 450 minutes. We also provide a process for making the lubricating oil, comprising: blending the Group II base oils to make a blended base oil mixture and adding to the blended base oil mixture: a DI additive package designed to meet API CJ-4, and a viscosity modifier; wherein the lubricating oil has a TBN from 8.55 to 11.00 and provides an Induction Time in a CMOT from 270 to 450 minutes.