In the winter most of my driving is cold start (in garage) - 5.5 miles - cold start (in parking lot at work) - 5.5 miles home. So now I wonder if by going to EFE I am sacrificing startup/cold operating protection. one that is closer to the desired operating temp value) will protect better at cold temps than the lower VI oil because it flows better (more like normal) through the passages. It means that an oil with a better/lower 40C viscosity (i.e. The desired 30 wt (the 30 in 5w30) viscosity at operating temp is between 9.3 and 12.5.Ī higher viscosity index (VI) is better because it means that at low temps the oil is closer to the desired running viscosity.
X-clean EFE 5w30 40C viscosity = 70.1 100C viscosity = 12.1 viscosity index = 169 HTHS = 3.5 I am currently using (but considering going away from to X-clean EFE)Įneos Sustina 5w30 40C viscosity = 51.5 100C viscosity = 10.3 viscosity index = 194 HTHS = 3.1 Viscosity that is ~25% higher than other oils with an HTHS ~3.0-3.1. One thing that I have noticed is that while the X-clean EFE is a HTHS 3.5 oil it also has a cold
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