A long-term independent study was carried out by POLARIS Laboratories Europe to assess whether installing Delta-Xero filtration on a landfill gas engine would negatively affect lubricant condition, additive performance, or expected oil drain intervals.
A long-term independent study was carried out by POLARIS Laboratories Europe to assess whether installing Delta-Xero filtration on a landfill gas engine would negatively affect lubricant condition, additive performance, or expected oil drain intervals. Concerns focused on potential depletion of critical additives such as reserve alkalinity (Base Number), which is essential for protecting gas engines from acid-related wear.
Customer impact & assurance
Independent oil analysis data confirmed that when Delta-Xero filter units were in service:
No abnormal depletion of Base Number was observed over time
Acid Number and oxidation followed normal, expected trends
Lubricant stability and protection were maintained, with no evidence of additive stripping or accelerated degradation
The full case study explains why additive health remained stable, how results compared against thousands of comparable gas engine samples, and what this means for oil drain confidence and engine protection.
Access the full results
Download the complete independent proof-of-performance study from POLARIS Laboratories, including Base Number trends, Acid Number data, and expert conclusions.
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