When you're measuring high-temp/high-shear viscosity, or HTHS, Loop explained, it is measuring the viscosity of the oil as it would be in the engine, where it's being flung around at high ...

The lower the measured torque in a 300-degree Fahrenheit engine, the lower the HTHS viscosity of the oil and the higher the fuel efficiency. The NCDT was formed to look at all necessary steps.

To meet the expected greenhouse gas/fuel efficiency standards the federal government is in the process of developing, oil companies and engine makers have been busy developing a new standard for ...

“Beyond the OEM recommendations, it’s worth keeping in mind that the primary difference between FA-4 and CK-4 is the level of high-temperature high-shear, or HTHS, viscosity,” Humphrey note ...

BEST OF MAY E&MU: More stories, columns FA-4 is a lower-viscosity lube designed to save ... 4 must pass the high-temperature high-shear, or HTHS, requirement designed to test the oil’s ability ...

The FA4 oils are blended to a high-temperature, high-shear (HTHS) viscosity range of 2.9 centipoise (cP) to 3.2 cP to assist in reducing greenhouse gas emissions. They are especially effective at ...

Low viscosity engine oils also undergo the same qualification ... savings over API CK-4 of the same grade – up to 1% when comparing an SAE XW-30 with 3.5cP HTHS to an XW-30 with 3.1cP HTHS. Added to ...

In addition, API FA-4 introduced fuel economy SAE XW-30 grades with high temperature, high shear (HTHS) viscosity range of 2.9cP–3.2cP for fleets’ on-highway applications. To meet government ...

Prior to this year’s Technology and Maintenance Council’s annual meeting, Overdrive sister site CCJ had the chance to talk to ExxonMobil’s Lilo Hurtado, the company’s senior applications ...