OCLS and POLARIS Laboratories®
Oil and Diesel Fuel Analysis by Oil Check
In 2026, Oil Check Laboratory Services Ltd (OCLS) was acquired by POLARIS Laboratories®, a global provider of fluid analysis and reliability services. OCLS continues to operate independently from its Doncaster facility, maintaining its experienced team, technical expertise, and customer-focused approach.
Our Mission
To provide reliable fluid analysis, advanced diagnostics and intuitive data management technology that help organizations optimize maintenance strategies, reduce failure risk and extend equipment life.
Our Aims
To ensure analytical equipment and training remains cutting edge, utilising a continuous training programme for staff so that we may continue to deliver a reliable and cost effective service.
We at Oil Check believe that ongoing improvement is the only way to ensure the best customer service is provided at all times. We will continue to interact with the customer, resulting in free aftercare and exchange of information, enabling you to derive maximum benefit from our oil testing services.
Our Services
OCLS provides professional engine oil analysis and diesel fuel filtration solutions for oil condition monitoring and engineering-related issues requiring lubricant analysis.
Learn more: Oil Testing Services
OCLS: Areas of industry covered including but not limited to:
Construction Plant – Komatsu, Terex, Caterpillar, Hitachi, JCB, Volvo
Mining Equipment – Joy, Eickhoff, DBT, Dosco, Voest-Alpine, Eimco
We Have a Far Reaching Scope of Expertise Which Includes but not limited to:
Railway Transport – Engines, Hydraulics/Motors, Gearboxes & Transformer oil analysis.
Marine Equipment – Engine oil analysis, Hydraulics, Gearboxes, Driver systems, Bunker fuels & Marine Diesel testing.
Wind Turbines – Gearbox Oils, Hydraulics, Platform equipment
Generators – Standby and Plant Generators, Steam and Gas Turbines, Coolant, Fuel analysis.
Transport/ Road Haulage – Engine, Transmission, Hydraulics- Steering, Brakes, Adblue, Diesel and Coolant Analysis for new & old domestic and commercial vehicles.