Test Your Lubricant with Confidence

At RM Propulsion, we help oil manufacturers ensure their lubricants deliver peak performance in marine environments. Through our specialized seal testing facility, you gain valuable insights into how your lubricants perform with stern tube seals, tested under realistic, operational conditions. Whether you’re developing new formulations or validating existing ones, our in-house test machine for stern tube seals provides the performance data and assurance you need.

Not only is this machine capable of testing stern tube seals, but it can also test shaft seals of bow and azimuth thrusters, offering a versatile platform for comprehensive seal performance evaluation. Moreover, this enables you to make informed decisions with confidence.

Disclaimer:
Please note, we focus solely on operational seal testing. We do not offer laboratory chemical analysis for used oil, including tests for viscosity, acidity, water content, or wear particles.

Precision Testing for Oil Makers

Pioneering Marine Seal Technology with Real-World Oil Testing

We empower oil manufacturers to validate and enhance their lubricants through advanced testing in our dedicated oil testing facility. In particular, we work with both mineral oils and Environmentally Acceptable Lubricants (EALs). As a result, you receive clear, actionable data that supports product innovation and builds customer trust.

 

Furthermore, our in-house seal testing facility provides a controlled environment that accurately replicates real marine conditions. Consequently, you gain a precise understanding of how your oil interacts with critical seal materials. All in all, this leads to better products, fewer surprises, and stronger partnerships.

Oil Testing Facility – Built for Real-World Simulation

Our seal testing facility was specifically designed to replicate the operating conditions of a real marine propulsion system. The facility is a full-scale replica of a propeller shaft and stern tube, complete with all major components found on an actual vessel, including:

  • Gravity tank

  • AFT and FWD seal monitoring tanks

  • Complete stern tube system with shaft and seals

Consequently, we can simulate a wide range of operational conditions, such as:

  • Variable shaft speeds

  • Different vessel drafts

  • Adjustable oil pressure and flow

  • Controlled sea water temperature

  • Oil temperature adjustments

  • Realistic conditions for any seal size and any commercial vessel type

In this way, we provide a versatile platform to test how lubricants perform under real-world marine stresses, enabling oil makers to evaluate oil-seal interaction with precision. As can be seen, our approach delivers valuable insights that go beyond standard laboratory environments.

Important Disclaimer

However, please note: RM Propulsion does not offer laboratory chemical analysis for used oil samples. Our services do not include testing for:

  • Viscosity changes

  • Acidity or water content

  • Wear particles or contaminants

Instead, we focus exclusively on operational performance testing, providing real-time evaluation of how lubricants function within a full-scale marine seal system under controlled, customizable conditions.

Oil Testing for Mineral Oils and EALs

We offer comprehensive seal testing for both types of marine lubricants:

  • Mineral Oils – These traditional marine lubricants are known for their consistent performance profiles and wide acceptance across vessel types.

  • EAL Oils – These eco-friendly lubricants are essential for environmental compliance; however, they often require careful validation due to variable behavior in seal systems.

Moreover, we don’t just evaluate basic oil properties. Not only do we analyze seal compatibility, wear, and durability, but we also ensure that your oil performs effectively under dynamic marine conditions. As a result, our findings help you optimize product performance and improve customer confidence.

What Oil Makers Gain from Stern Tube Seal Oil Testing

Oil manufacturers benefit from our testing in several critical ways. To begin with, we provide:

  • Detailed analysis of seal material compatibility
    Assess how oils affect seals, including swelling, degradation, and long-term material behavior. Consequently, you gain valuable insight into lubricant impact on seal reliability.
  • Identification of potential wear risks and failure points
    Understand critical stress areas and how different lubricants influence seal durability. As a result, you can take proactive steps to minimize failures.
  • Validation of lubrication effectiveness under real-world stresses
    Simulate pressure, temperature, and motion to test oil performance in realistic marine conditions. Therefore, your product is proven where it matters.
  • Comparative testing of multiple oils
    Evaluate and compare performance across lubricants, including effects on seal temperature, power absorption, and friction levels. This enables better decision-making based on hard data.
  • Assessment of oil impact on seal lifetime
    Analyze how specific lubricants influence seal wear rates and projected service life. In turn, this helps improve product longevity and customer satisfaction.
  • Compatibility analysis between oil and seal materials
    Determine both chemical and physical compatibility to minimize risk and optimize reliability. In this way, you ensure seamless integration between your oil and marine systems.
  • Independent, third-party performance reporting
    Deliver trusted data to your customers and OEM partners, supporting informed decisions and building long-term product credibility.

 

In summary, our oil testing services support innovative product development and help you strengthen your position in the competitive marine lubricant market.

Initiate Your Seal Testing Process with RM Propulsion

Partner with RM Propulsion to elevate your lubricant’s performance and reliability. Our advanced seal testing facility proves your lubricant’s durability and compatibility in demanding marine environments, giving you confidence in every drop.

Submit Your Oil for Stern Tube Seal Oil Testing

Are you ready to put your oil to the test? Our stern tube seal oil testing program is designed for oil manufacturers seeking reliable, real-world validation. Whether you’re launching a new lubricant or verifying an existing formulation, we’ll provide the evidence-based insights you need.

How It Works:

  1. Contact us here to discuss your oil and testing needs.

  2. Then, you will receive a quotation (within 1-3 working days) outlining the testing scope, timeline, and cost.

  3. After confirming our quote, ship your oil samples to our testing facility
  4. Finally, you will receive a detailed report with performance data.

RM Propulsion test machine FWD stern tube seal housing

Case Study: EAL Oil Performance – Understanding Variability

 

The Challenge
At RM Propulsion, we observed inconsistent performance from different Environmentally Acceptable Lubricants (EALs) used in stern tube seals. While some lubricants worked well, others caused unexpected seal issues such as wear or swelling.

 

Our Response
Instead of simply recommending oil changes, we investigated the root cause using our in-house oil testing facility, simulating real marine conditions. We tested multiple EAL oils to assess seal compatibility and performance.

 

Key Finding

Our research showed significant variations between EAL oils, due to differences in viscosity and chemical composition. These factors directly impacted seal integrity and reliability.

 

Industry Contribution

Our findings were published in Motorship, helping customers make informed decisions and sparking broader industry discussion on EAL-seal compatibility.