If any sample fails to meet the ACEA sequences, including the applicable HTHS viscosity limits, SAIL issues a report to the marketer, inviting them to comment on the findings. The marketer is then required to outline corrective actions to address the non-compliance.
In 2025, SAIL managed over 3,000 individual tests as part of the compliance programme. These efforts help to maintain high-quality standards in the lubricants market and provide consumers with confidence in the products they use. SAIL’s compliance monitoring programme has identified that HTHS non-compliance remains a significant risk area, particularly for lower-viscosity engine oils designed to deliver improved fuel economy.
The correct selection of viscosity index improver (VII) with adequate shear stability is essential to avoid high-temperature engine protection failures. VII interchange is only permitted within the ATIEL Code of Practice when substitution of the VII in the original final formulation with an alternative VII is supported by a Viscosity Index Improver interchange programme. VII interchange guidelines developed by ATIEL are clearly defined in the Code of Practice. Unsupported
VII interchange is likely to affect the balance of key component interactions, which may lead to sub-optimal protection under high-temperature, high-shear operating conditions.
If in doubt, please consult your reputable technology provider.
Contact: Eleonora Piccinni:
info@eelqms.eu
www.eelqms.eu
LUBE MAGAZINE NO.193 JUNE 2026
55
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