The fight against Low-Speed Pre-Ignition (LSPI) has advanced with the Aged Oil LSPI Prevention Test, a major addition to modern lubricant specifications. This innovation ensures that turbocharged, direct-injection engines are protected throughout the entire oil drain interval—not just when fresh.

✨ Why LSPI Matters

LSPI is an abnormal combustion event in turbocharged gasoline direct injection (T-GDI) engines, occurring under low-speed, high-torque conditions like accelerating from a stop. LSPI creates violent pressure spikes, potentially causing severe engine damage.

With automakers increasingly adopting downsized turbocharged engines for fuel efficiency, LSPI has become a persistent challenge. The industry addressed this with API SN PLUS (2018) and later API SP & ILSAC GF-6 (2020), incorporating Sequence IX LSPI testing. However, real-world data showed that oils effective when fresh did not always maintain LSPI protection as they aged, leading to a need for new testing protocols.

🌟 The Game-Changer: Aged Oil LSPI Testing

The Aged Oil LSPI Prevention Test subjects engine oils to controlled aging before evaluating their LSPI protection. This ensures that LSPI resistance remains strong over the entire drain interval, addressing OEM concerns about long-term engine protection.

Key findings from research:

High-calcium detergents with molybdenum/titanium tend to increase LSPI as oil ages.

Magnesium-based formulations offer more stable LSPI protection over time.

💡 Impact on Oil Formulation

With aged oil LSPI testing, lubricant formulators must adjust additive chemistry to ensure long-term LSPI resistance:

Lower reliance on high-calcium detergents, shifting toward magnesium-based solutions.

Optimised friction modifiers and anti-wear additives to balance LSPI prevention with performance.

Stronger antioxidants to slow the degradation of LSPI-protective components.

These adjustments mark an exciting era in lubricant innovation, driving more robust, long-lasting formulations.

⚙️ Industry Implications

For blenders, additive suppliers, and automakers, aged oil LSPI testing sets a higher performance standard, leading to:

Reduced engine warranty claims related to LSPI damage.

Extended engine durability, with consistent LSPI protection over oil life.

Stronger OEM alignment, as manufacturers push for more reliable LSPI mitigation strategies.

🌟 Raising the Bar for Engine Oil Performance

Aged oil LSPI testing represents a significant evolution in lubricant performance standards. It ensures that engine oils protect modern T-GDI engines throughout their lifespan. Expect continued advances in additive technology and oil formulations to meet these higher standards.

At Valorem Chemicals, we continue to monitor advancements in lubricant technology and provide industry insights to help our partners navigate these evolving standards.