{"data":{"id":"us/40-cfr-1065.122","jurisdiction":"us","citation":"40 CFR 1065.122","heading":"Engine cooling and lubrication.","body":"(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.\n(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.\n(2) See § 1065.125 for more information related to intake-air cooling.\n(3) See § 1065.127 for more information related to exhaust gas recirculation cooling.\n(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.\n(b) Forced cooldown. You may install a forced cooldown system for an engine and an exhaust aftertreatment device according to § 1065.530(a)(1).\n(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.\n(d) Coolant. For liquid-cooled engines, use coolant as specified in § 1065.745.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1065—ENGINE-TESTING PROCEDURES","Subpart B—Equipment Specifications"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"4d74300369e188744f9acf5b5d69d322e45d0cf33626e1600e4f9a5445aa5e0c","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1065.120","next":"us/40-cfr-1065.125"},"notice":"GroundRules: Original legal text. Not legal advice."}