The C1.6 from Caterpillar offers 24.6 and 26.5 kW (33 and 35.5 hp) at 2800 and 3000 rpm, respectively. Designed to meet 2008 Tier 4A, Stage IIIA emissions requirements, the C1.6 offers a top speed of 3000 rpm. Noise levels are reduced to 68 dB(A) at low idle due to a redesigned combustion system, and subjective harshness also has been reduced. A compact 0.10 m3 (0.33 ft3) package eases installation and provides 195 kW/m3 (640 kW/ft3) power-to-envelope ratio. Single-side servicing improves maintenance and simplifies the routine; service intervals of 500 h are standard. Cold start capability is -20°C (-4°F), and gradeability is 35°C (95°F) continuous.