Leading the Way in Oil Filtration Excellence

50 Years of Leadership in Cellulose Depth Filtration

Since 1976, KLEENOIL has specialised exclusively in cellulose depth filtration, delivering trusted oil filtration solutions across the UK and worldwide.

Our systems are used across every industrial and commercial sector—from transport and power generation to marine and hydraulic systems—ensuring cleaner oil, longer equipment life, and better machine hygiene.

Born from Innovation, Proven Through Time

KLEENOIL was established following the Israeli-Egyptian war of 1974, during a time of heightened global awareness around oil conservation. Originally developed to extend oil life in the transport sector, the system quickly proved effective across a wide range of applications.

By 1986, after a decade of success in the domestic UK market, KLEENOIL began exporting—and has since grown to serve over 20 countries worldwide, directly supplying systems for vehicle engines, generators, marine vessels, and increasingly, hydraulic oil purification.

The KLEENOIL Difference

For over 50 years, KLEENOIL has been a market leader in bypass cellulose depth filtration, offering a full-service solution: from in-house design and manufacturing to installation, support, and condition monitoring — all based in the UK.

What Is Bypass Cellulose Depth Filtration?

Bypass filtration (also known as kidney-loop or polishing filtration) works alongside a system's primary filter. It continuously filters a small portion of oil at low speed using highly absorbent media for deeper cleaning.

Unlike full-flow systems that process all oil quickly, bypass filtration works slowly and thoroughly—removing contaminants that conventional filters miss.

Why Bypass Is Better Than Full-Flow Filtration

How It Works

The system continuously cycles oil through a high-density filter and returns clean oil back to the system, improving overall cleanliness over time.

This continuous polishing process ensures your oil stays cleaner for longer, reducing wear, extending component life, and minimising downtime.

Why Cellulose Depth Filtration?

The media captures contaminants throughout its depth, not just on the surface. This provides:

• Higher contaminant holding capacity
• Reduced clogging risk
• Consistent filtration performance
• Extended filter life and lower operating costs

Clean Diesel Matters More Than Ever

Modern engines require extremely clean fuel. Contamination causes injector damage, poor combustion, and costly downtime.

Proven Over Time — Still Unrivalled Today

KLEENOIL remains one of the most trusted filtration systems globally due to its simplicity, reliability, and performance.

From our origins in 1976 to serving industries worldwide today, we've never stopped innovating—while staying true to the core principles that made us a leader in oil filtration.