Section 1065.122 - Engine cooling and lubrication(a)Engine cooling. Cool the engine during testing so its intake-air, oil, coolant, block, and head temperatures are within their expected ranges for normal operation. You may use auxiliary coolers and fans. (1) For air-cooled engines only, if you use auxiliary fans you must account for work input to the fan(s) according to § 1065.110 .(2) See § 1065.125 for more information related to intake-air cooling.(3) See § 1065.127 for more information related to exhaust gas recirculation cooling.(4) Measure temperatures at the manufacturer-specified locations. If the manufacturer does not specify temperature measurement locations, then use good engineering judgment to monitor intake-air, oil, coolant, block, and head temperatures to ensure that they are in their expected ranges for normal operation.(b)Forced cooldown. You may install a forced cooldown system for an engine and an exhaust aftertreatment device according to § 1065.530(a)(1) .(c)Lubricating oil. Use lubricating oils specified in § 1065.740 . For two-stroke engines that involve a specified mixture of fuel and lubricating oil, mix the lubricating oil with the fuel according to the manufacturer's specifications.(d)Coolant. For liquid-cooled engines, use coolant as specified in § 1065.745 . 70 FR 40516 , July 13, 2005, as amended at 73 FR 37293 , June 30, 2008