[Fulltiming]

Effective for 2007 model year ENGINES, crankcase emissions (slobber tube gases) had to be added to the exhaust emissions for emission testing compliance. CAT responded with their ACERT 2 (second generation) engines which used particulate filters and NOx catalysts to achieve emissions compliance. They announced in 2008 that they would be exiting the U.S. highway engine market prior to the 2010 emission standards taking effect.