Rock Oil’s GEN-GUARD range of engine oils is engineered to deliver exceptional performance across a wide spectrum of stationary gas engines operating under the most demanding conditions. Designed for use with Natural Gas, Biogas, Landfill Gas, Sewer Gas, and Wood Gas, these high-performance lubricants are ideal for applications in power stations, landfill sites, sewage plants, and biogas facilities.
Meeting API CF performance specifications recommended by industry-leading OEMs such as Caterpillar and Jenbacher, GEN-GUARD oils are trusted for their reliability in power generation, industrial applications, and waste-to-energy environments. They provide optimal engine protection, extended service intervals, and enhanced operational efficiency, ensuring long-term performance and compliance with regulatory standards.
To further support engine longevity and efficiency, an OEM-approved coolant is also available as part of the GEN-GUARD range.
Why Choose GEN-GUARD?
- Extended Oil Change Intervals – Formulated for durability, GEN-GUARD allows longer drain intervals — reducing downtime and maintenance costs.
- Superior Wear & Oxidation Protection – Resists thermal breakdown and wear, ensuring consistent lubrication under demanding conditions.
- Low-Ash, Zinc-Free Formula – Minimises abrasive deposits, protecting engine components and supporting cleaner combustion.
- Enhanced Engine Cleanliness – Keeps engines free of sludge and varnish for smoother performance and easier maintenance.
- Catalyst & Engine Life Protection – Low phosphorus loss helps extend catalyst durability and supports emissions compliance.
GEN-GUARD Product Range
GEN-GUARD SG 40
A high-performance, low ash engine oil designed for high-speed gas engines running on gases of varying compositions from AD plants, landfill sites, and wood chip gasifiers. It is ideal for severe service applications requiring low ash oils or where ‘sour gas’ is used.
Key Features:
- Effective TBN reserve to control acids and nitrates
- Excellent detergent/dispersant characteristics for outstanding engine cleanliness
- Outstanding corrosion protection for engines running on harsh gases
GEN-GUARD PLUS SG 40
A high-performance, medium ash engine oil tailored for high-speed gas engines operating under severe conditions, including those using ‘sour gas’. Provides enhanced protection for engines requiring medium ash lubricants.
Key Features:
- Formulated with high-quality Group II base oils and advanced salicylate detergent chemistry
- Significantly extended drain intervals compared to conventional gas engine oils
- Low levels of Zinc and Phosphorus to improve catalytic converter life
GEN-GUARD SG ELITE 40
A high-performance, high ash engine oil developed specifically for high-speed gas engines operating on extremely corrosive landfill gases with elevated H₂S levels. GEN-GUARD SG ELITE 40 offers superior protection against acid etching caused by sulphuric acid formation, ensuring extended engine life under the harshest conditions.
Key Features:
- High-quality Group II base oils with advanced salicylate detergent chemistry
- Exceptional corrosion protection for engines exposed to aggressive gases
- Effective TBN reserve to control acid and nitrate formation
- Excellent engine cleanliness through strong detergent/dispersant action
- Low Zinc and Phosphorus (<300ppm) for improved catalytic converter performance
- Optimised for applications using gas from landfill, digester, or sewage sources
Trusted by Industry Leaders
GEN-GUARD engine oils meet API CF performance specifications and are recommended for use in stationary engines from leading manufacturers, including:
- Caterpillar
- Guascor
- Jenbacher
- MWM
- MAN
- Waukesha
Partner with Rock Oil
Rock Oil’s Industrial Division is your trusted partner for high-performance lubrication solutions. From product selection to strategic optimisation, our expert team provides tailored guidance to meet your unique operational needs.
Contact us today to discover how Rock Oil can help maximise your gas engine operations’ efficiency, reliability, and sustainability.
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GEN-GUARD SG 40
Gen-Guard SG 40 is a high performance, low ash engine oil designed to help protect high speed gas engines running on gases of varying compositions from AD Plants, Landfill sites…
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Gen-Guard Plus SG 40 is a high performance, medium ash engine oil designed to help protect high speed gas engines running on gases of varying compositions from AD Plants, Landfill…
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