ILMA Compoundings August 2016 - (Page 21)

THE EVOLUTION OF GROUP II Growth of Group II in Marine and Gas Engine Oils John Smythe T rends in automotive crankcase lubricant formulations, which account for more than half of the base stock utilization, are impacting the supply and demand balance of base stocks globally. As this sector looks to improve fuel economy and reduce emissions, the use of high-quality Group II and III base stocks is growing quickly. The inability of Group I products to deliver the right characteristics for automotive applications has resulted in a number of capacity reductions and plant closures in Europe, which have reduced supply by more than a million tonnes. Over the same period there has been a significant increase in the availability of Group II base stocks as new plants and capacity additions have come on stream. This has driven down the cost, making their use in application increasingly attractive. With further capacity additions scheduled over the next two to three years, a shift to these higher-quality products in both gas engine and marine applications seems fairly inevitable. Group II Benefits and Challenges in Marine Group II base stocks have a number of benefits over their Group I counterparts when formulating trunk piston engine oils (TPEO) for medium-speed, four-stroke engines. These include: * Better oxidation control. challenges - particularly concerning asphaltene handling capabilities. Most of the ships that use TPEO run on heavy fuel oil, which contains large polyaromatic species known as asphaltenes. During engine operation, these species can migrate into the engine oil via fuel contamination. Here they can agglomerate to form "black sludge," which leads to high levels of deposit formation and results in piston deposits, choked oil galleries and oil starvation. Deposits on the piston undercrown are of particular concern because they act as insulation, preventing the lubricant from effectively transferring heat away from the piston, which can lead to hot corrosion of the piston crown. Oils formulated in Group I base oils with salicylate technology have demonstrated excellent performance over many years of field operation. Not only do they offer excellent asphaltene handling capabilities, but also excellent engine protection and oil life, as well as reduced operating costs. But the picture is very different when Group II base stocks are used. Their lower solvency means conventional additives are less able to handle asphaltenes, and a new additive system is required to ensure TPEO formulated in these highquality base stocks deliver the required level of engine cleanliness. Group II in Gas Engine Oils * Improved NOACK stability. * Enhanced viscosity control. However, using Group II to develop TPEO also presents lubricant formulation Until recently, Group I base stocks have been the basis of most stationary gas engine oil formulations. But again, the demand for higher-performance lubricants from engine manufacturers means this picture is changing. Compoundings August 2016 * 21 * Vol. 66 No. 8

Table of Contents for the Digital Edition of ILMA Compoundings August 2016

FROM THE CEO
FROM THE PRESIDENT
BOARD BRIEF
NOTES FROM NLGI
THE HEART OF ILMA
In Memoriam Mike Ryterski (1920–2016)
Radco Industries Promotes Brian Finch
Manufacturing Day is Coming! October 7, 2016
THE EVOLUTION OF GROUP II
VOICES & VIEWS
INTERNATIONAL INSIGHT
FOCUS ON ETHICS
FAMILY BUSINESS
RULES & REGS
POWER PLAY
LEGAL EASE Preparing for Brexit
THE WHITE PAPER

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