Low viscosity engine oil compositions

An engine oil composition, comprising in admixture:

• 60 wt % to 90 wt % of a first base oil component, based on the total weight of the composition, the first base oil component consisting of a polyalphaolefin base stock or combination of polyalphaolefin base stocks, each having a kinematic viscosity at 100° C. of from 3.2 cSt to 3.8 cSt and a Noack volatility of less than or equal to 12.5 wt. %;
• and
• 0.1 wt % to 20 wt % of a second base oil component, based on the total weight of the composition, the second base oil component consisting of a Group II, Group III or Group V base stock, or any combination thereof;
• wherein the composition comprises from 0 wt % to less than 0.25 wt % viscosity index improver, on a solid polymer basis;
• wherein the composition has a kinematic viscosity at 100° C. of from 4 to 6 cSt, a Noack volatility of less than 15% as determined by ASTM D5800, a CCS viscosity of less than 3500 cP at −35° C. as determined by ASTM D5293, and an HTHS viscosity of less than 2.6 mPa-s at 150° C. as determined by ASTM D4683.