Monex Marine Engine Oils
Engineered for reliability, cleanliness, and long service at sea. Explore Orsa Max 50, Rudder Max 40, and Wave Max 30 for low- and medium-speed marine diesel engines and auxiliary equipment.
Why marine engine oils matter
Marine oils must lubricate, cool, control deposits, neutralize acids, and protect against wear — under long duty cycles, variable fuel quality, and strict emissions limits. The right oil reduces unplanned downtime and extends component life across main and auxiliary engines.
Product overview & comparison
| Product | Engine Type / Application | Fuel Context | What it's built to do |
|---|---|---|---|
| Orsa Max 50 | Low-speed crosshead main engines; auxiliary where OEM recommends | Primarily distillate diesel (check OEM); sulfur up to ~1.8% | High oxidation/thermal stability; deposit & soot control; high TBN for acid neutralization; wear protection |
| Rudder Max 40 | Medium-speed trunk piston diesel engines | Heavy residual fuel (check OEM); sulfur up to ~2% | Alkaline API CF-level profile; detergency/dispersancy; high TBN; anti-wear under load |
| Wave Max 30 | Medium-speed / auxiliary equipment where SAE 30 is specified | Distillate/hybrid per OEM guidance | SAE 30 marine crankcase performance; match to duty cycle and OEM recommendations |
Always verify OEM approvals and fuel sulfur context when selecting a crankcase or cylinder oil.
Orsa Max 50
Mineral-based marine oil designed to keep engines clean, neutralize acidic byproducts, and protect against wear in demanding service.
Why it works
- High oxidation & thermal stability for slower oil aging
- Detergent/dispersant system for deposit & soot control
- High TBN to neutralize acids and protect against corrosion
- Anti-wear additives to protect bearings under heavy loads
Typical use cases
- Low-speed crosshead main engines (per OEM recommendation)
- Auxiliary equipment where the OEM specifies this grade
- Operators targeting extended service intervals with analysis
Confirm viscosity grade, BN, and OEM approval before switching formulations. Plan a controlled changeover.
Rudder Max 40
Alkaline, dual-purpose API CF-level oil for medium-speed trunk piston engines operating on heavy residual fuels.
Why it works
- High oxidation & thermal stability for longer drains
- Strong detergency/dispersancy to keep systems clean
- High TBN for acid neutralization and corrosion protection
- Anti-wear package for bearings and loaded components
Application notes
- Match BN to fuel sulfur and duty cycle
- Verify OEM approvals and service letters before use
- Pair with routine oil analysis to optimize intervals
Suitable for certain low-speed crosshead applications if OEM recommends. Always cross-check specification.
Wave Max 30
SAE 30 marine crankcase profile for medium-speed and auxiliary equipment where OEM specifies a 30-grade oil.
Where it fits
- Auxiliary and medium-speed applications requiring SAE 30
- Distillate/hybrid fuel contexts per OEM guidance
- Operators seeking stable viscosity and cleanliness
Selection checklist
- Confirm viscosity grade (SAE 30) and OEM approval
- Match BN to fuel sulfur and operating regime
- Use analysis data to tune drain intervals
Best practices for marine lubrication
Condition monitoring
- Routine lab analysis: TBN/TAN, viscosity @40/100 °C, insolubles
- Watch oxidation/nitration trends and contamination (fuel/water)
- Adjust drain intervals based on data, not just hours
Handling & changeover
- Store drums dry, covered; dedicate clean transfer equipment
- Prevent water/fuel ingress; verify separator/filters
- Use a controlled procedure for brand/grade changeover
Resources & downloads
- Orsa Max 50: TDS · SDS · Product page
- Rudder Max 40: TDS · SDS · Product page
- Wave Max 30: SDS · SDS · Product page
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