EAL Lubricants: The Benefits of Switching from Mineral to Synthetic Lubes

In today’s marine and industrial sectors, lubricant choice plays a pivotal role in equipment performance, compliance, and sustainability. While mineral oils have long been the standard, many operators are now making the switch to synthetic lubricants – specifically, Environmentally Acceptable Lubricants (EALs).

This shift isn’t just a matter of trend; it’s driven by real-world benefits that impact performance, cost-efficiency, and environmental responsibility. Here, we take a closer look at what synthetic EALs are and why switching from mineral oil makes sense.

What Are Synthetic Lubricants?

Synthetic lubricants are engineered oils produced through chemical synthesis. Unlike mineral oils, which are refined from crude oil, synthetics are built molecule by molecule, resulting in a purer and more consistent product.

They typically feature:

• Fewer impurities
• Better oxidative stability
• Enhanced viscosity across a wider temperature range

John Rushmer, General Manager of Williams Shipping Lubricants, commented:
“Many synthetic lubricants used in marine applications are based on synthetic esters. These esters not only provide excellent lubricity and thermal stability but are also inherently biodegradable, making them particularly well-suited for use in the marine sector. EAL (Environmentally Acceptable Lubricants) offer exceptional performance in critical areas of application including stern tube, hydraulic systems and gear box.”

These properties make synthetic lubricants ideal for high-stress or variable environments like marine engines, hydraulic systems, and gearboxes.

What Makes a Lubricant Environmentally Acceptable (EAL)?

EALs are designed to minimise environmental impact, especially in applications where oil discharge into the environment is possible. International standards such as the U.S. EPA’s Vessel General Permit (VGP) and ISO 15380 outline the key characteristics of an environmentally acceptable lubricant. These include being:

EALs are designed to minimise environmental impact, especially in applications where oil discharge into the environment is possible. According to the U.S. EPA’s Vessel General Permit (VGP), EALs must be:

• Biodegradable – able to break down naturally in the environment through microbial action, reducing long-term pollution risks
• Non-bioaccumulative – does not build up in the tissues of marine organisms or move up the food chain, helping to protect wildlife health
• Minimally toxic to aquatic life – formulated to limit harm to fish, crustaceans, and other marine species if accidental discharge occurs

This makes them particularly suitable for marine applications, port equipment, and offshore operations. Many synthetic lubricants meet or exceed these criteria, making them a reliable option for organisations prioritising sustainability.

Key Benefits of Switching from Mineral to Synthetic EALs

Superior Equipment Protection

Synthetic EALs offer better film strength and wear protection compared to mineral oils. This reduces component wear and extends the life of critical systems.

Longer Lubricant Life

Thanks to their resistance to oxidation and thermal breakdown, synthetic oils can last significantly longer than mineral oils. This translates to longer drain intervals, reduced downtime, and lower maintenance costs.

Operational Efficiency

Improved cold-start performance and stable viscosity across temperatures mean machinery runs more smoothly and reliably, even in challenging marine environments.

Lower Total Cost of Ownership

Although the upfront cost of synthetic EALs is higher, the extended service life and reduced maintenance often lead to overall cost savings.

Environmental Compliance and Responsibility 

Switching to EALs helps meet environmental regulations and demonstrates a commitment to sustainability – a key concern for clients, regulators, and supply chain partners.

Cleaner Operation

Synthetic oils form fewer deposits and sludge, helping to keep machinery clean and reduce the risk of clogged filters or component wear over time.

Enhanced Oxidation Resistance at High Temperatures

Synthetics maintain their stability and protective qualities even in extreme heat, reducing oil breakdown and protecting critical components for longer.

Switching to EALs helps meet environmental regulations and demonstrates a commitment to sustainability – a key concern for clients, regulators, and supply chain partners.

For more general information about synthetic oil performance, see our previous article on the benefits of synthetic lubricants.

Here’s a side-by-side comparison of mineral oils and synthetic EALs:

Why Do Some Still Use Mineral Oils?

Despite the benefits, some operators continue using mineral oils due to:

• Lower purchase price
• Familiarity and legacy equipment requirements
• Misconceptions about synthetic oil compatibility or risks

However, with the growing emphasis on performance and environmental impact, the case for switching grows stronger each year.

What to Consider When Making the Switch

Before transitioning to synthetic EALs, consider the following:

• OEM approvals – Always check that the lubricant meets manufacturer specifications.
• Compatibility – Some legacy seals or systems may need checking for synthetic compatibility.
• Transition process – System flushing may be required to remove residues of mineral oil.
• Expert support – Work with a trusted supplier such as Williams Shipping to guide the changeover smoothly.

FAQs

Are synthetic lubricants really worth the cost?
Yes. While initially more expensive, their longer lifespan, improved protection, and reduced maintenance usually result in lower lifetime costs.

Do EALs perform as well as traditional lubricants?
In most applications, they perform as well or better. Synthetic EALs are engineered for durability, stability, and low toxicity.

Will switching require equipment changes?
Not always. However, it’s essential to assess compatibility and follow best practices during the transition.

Are synthetic lubricants suitable for all marine systems?
Most modern marine systems are compatible, but always consult OEM guidelines and technical support.

Conclusion

Switching to synthetic EAL lubricants isn’t just a nod to environmental compliance – it’s a smart operational decision. From performance to sustainability and long-term cost savings, the benefits are clear.

If you’re considering the move or want to learn more about the best lubricant options for your vessels or equipment, our expert team at Williams Shipping is here to help. Get in touch today to discuss your needs.