ISO 12156-2:2017

Overview

ISO 12156-2:2017 specifies the performance requirement (limit) for diesel fuel lubricity when assessed with the high-frequency reciprocating rig (HFRR). Part 2 of the ISO 12156 series defines the pass/fail criterion needed to ensure reliable operation of diesel fuel injection equipment with respect to fuel lubrication. This third edition (2017) updates the previous edition to align with changes in ISO 12156-1, adds a second test method, and improves precision.

Key topics and requirements

• Scope: Applies to fuels used in diesel engines where lubricity affects injector and pump reliability.
• Test method linkage: Uses the HFRR test methods defined in ISO 12156-1. Two HFRR methods are referenced:
  • Method A - Digital Camera
  • Method B - Visual Observation
• Referee method: In case of dispute, Method A (Digital Camera) is the referee method.
• Performance limit: The mandatory lubricity limit is a wear scar diameter (WSD ≤ 460 μm). Fuels producing a WSD greater than 460 μm do not meet the ISO 12156-2 limit.
• Designation: When specifying a fuel lubricity requirement, the standard is designated as “Lubricity ISO 12156-2”.

Practical applications

• Ensuring fuel injection equipment reliability - The WSD limit helps prevent excessive wear in high-pressure pumps and injectors caused by poor fuel lubricity.
• Fuel quality specification - Fuel producers and distributors can include ISO 12156-2 compliance in product specifications to demonstrate suitability for modern diesel engines.
• Supplier and OEM contracts - Engine manufacturers (OEMs) and fleet operators can define lubricity requirements to reduce maintenance and warranty risk.
• Laboratory testing and conformity assessment - Accredited test labs use the HFRR procedures in ISO 12156-1 and the limit in ISO 12156-2 to report compliance.
• Regulatory and procurement standards - Authorities and large buyers can reference the standard when setting minimum fuel quality criteria.

Who uses this standard

• Fuel producers and blenders
• Automotive and diesel engine manufacturers (OEMs)
• Independent fuel testing laboratories and quality assurance teams
• Fleet operators, fuel suppliers, and regulatory bodies

Related standards

• ISO 12156-1 - Diesel fuel - Assessment of lubricity using the HFRR - Part 1: Test method (defines HFRR test procedures used to determine WSD)
• Other fuel and lubricant standards (refer to ISO/TC 22 and ISO/TC 28 publications for related specifications)

Keywords: ISO 12156-2:2017, diesel fuel lubricity, HFRR, wear scar diameter, WSD 460 μm, fuel injection equipment, lubricity testing, ISO 12156-1.