MIL-PRF-21260E is a heavy-duty mil-spec preservative and lubricating oil formulated for internal combustion engines and power transmissions. Intended for engine break-in, shipment, or long-term storage, this engine preservation oil maintains metal surfaces, prevents corrosion, and provides reliable lubrication without active operation. Tectyl oils meet MIL-PRF-21260E requirements, ensuring trusted protection for new and rebuilt engines in military vehicles and industrial applications.
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MIL-PRF-21260E, PERFORMANCE SPECIFICATION: LUBRICATING OIL, INTERNAL COMBUSTION ENGINE, PRESERVATIVE BREAK-IN (31-JUL-1998) [SUPERSEDING MIL-L-21260D]., This performance specification covers engine oils suitable for preservation, break-in, and lubrication of reciprocating internal combustion engines of both spark-ignition and compression-ignition types, and of power transmission fluid applications in equipment used in combat/tactical service.
