Heavy Duty Trucking

JUL 2014

The Fleet Business Authority

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56 HDT • JULY 2014 www.truckinginfo.com T o meet the expected greenhouse gas/fuel effi- ciency standards the fed- eral government is in the process of developing, oil companies and engine makers have been busy developing a new standard for engine oils that will provide a new type of lower-viscosity oil to improve engine efficiency. The new API (American Petroleum Institute) category, being called PC- 11 during the development process, will be the standard for a new gen- eration of low-viscosity engine oils, which on-highway engine manufac- turers will use as part of their EPA 2017 GHG reduction strategies. Oils have changed a lot over the past 25 years to keep up with emis- sions technology, but it's been a decade since the last time we had a new oil classification. "The current CJ-4 standard has that's backwards-compatible with older engines. About viscosity John Loop, technology manager, engine oils, for Lubrizol, explains that viscosity is a measure of how things flow — "the degree to which a fluid resists flow under an applied force," or "the power of resisting a change in the arrangement of the molecules." A solid would have infinite viscosity, he says — a gas, very little. For the new oil category, it's not just a matter of using a lower-viscosity oil, but also one that will maintain its viscosity under high-temperature/ high-shear, or HTHS, conditions. HTHS is a different way of measuring viscosity than what you're probably used to. Kinematic viscos- ity is what you might envision when thinking of viscosity — gravitational flow. Think of a row of beakers with lasted well beyond the life of the typi- cal engine category," says Dan Arcy, global OEM technical manager for Shell Lubricants, who is heading up one of the API committees working on the new oil category. "Some of the engine tests are no longer available or no longer relevant. The types of hardware being used in engines has changed. We've gone to common rail injection systems; metallurgy has changed." While the new oil category will offer improvements in areas such as oxidation stability, aeration perfor- mance, scuffing/adhesive wear, and shear stability, one of the biggest changes is the viscosity change. One of the unique things about this category is there will actually be two different sub-categories. In addi- tion to the new low-viscosity oil for GHG/fuel economy, there will also be a higher-viscosity sub-category The lowdown on the new low-viscosity oils Deborah Lockridge • Editor in Chief Chevron conducted a live teardown of a Detroit DD15 engine, with more than 400,000 miles of service using Delo 400 XLE 10W-30, during the Mid-America Trucking Show. How low can you go? PHOTOS: EVAN LOCKRIDGE

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