Fuel efficiency for 5W+ engine oils
Though there is a strong trend toward lower viscosity engine oils to limit CO2 emissions through increased fuel economy, 5W+ grades are currently the most popular viscosity grades. Enhancing the fuel efficiency of these 5W+ grades is therefore an area of opportunity for new molecules and solutions that formulators can leverage for sustainability goals.
Lower-viscosity base oils can help improve fuel efficiency, but formulations also must meet low-temperature specifications for CCS viscosity while staying within the 5W+ viscosity grade.
Ester FE 2.X
To help passenger and heavy-duty vehicle engine oils extend fuel economy in 5W+ grades while conforming to SAE J300 specs, we have developed Ester FE 2.X, a co-base stock ester from bio-based feedstock that provides:
- Low viscosity
- Low volatility
- High viscosity index (VI)
- Low traction
With a ~5% targeted treat rate, Ester FE 2.X can enable heavier grades (5W+) to achieve fuel economy similar to lower viscosity 0W engine oils. Thanks to a unique viscosity profile, Ester FE 2.X boosts CCS viscosity but not the base oil viscosity (BOV). The lower BOV enables a higher additive treat rate without increasing viscosity or sacrificing fuel efficiency.
This chart shows how blending 5 wt.% Ester FE 2.X with a 4 cSt or an 8 cSt @ 100°C base oil allows for enhanced fuel efficiency while still meeting the CCS requirements of a 5W-30 engine oil blend.