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H. Meche, Associate Editor Low-emissions engine released for gas compression Caterpillar Oil & Gas offers a low-emission engine upgrade kit for select G3516 LE petroleum engines for gas compression applications. With the upgrade kit, existing engines can be modified to a lower-emissions configuration, enabling operation at 0.5 grams/brake horsepower per hour (g/bhp-hr) or 1 g/bhp-hr, not to exceed nitrogen oxide (NOx) levels. The engine upgrade is economic and minimally invasive. It allows the engine to offer the same power and fuel tolerance, while simultaneously increasing altitude and turndown capability. The power rating for the G3516 LE remains the same at 1,340 bhp at 1,400 r