Copyright © 2026 Certas Energy UK Limited trading as Broughton Lubricants. All rights reserved
Product Code: 1815G
Castrol Syntrax Universal Plus 75W-90 is a premium, fully synthetic multipurpose gear oil developed for use in manual transmissions, final drives and differentials. Designed to provide excellent wear protection, thermal stability and low-temperature performance, this versatile transmission oil is suitable for a wide range of passenger cars, commercial vehicles and construction equipment requiring API GL-4 or API GL-5 lubricants.
Formulated to deliver reliable performance in demanding operating conditions, Castrol Syntrax Universal Plus 75W-90 combines the benefits of synthetic lubrication with compatibility across a broad range of drivetrain applications. Its multipurpose formulation allows a single lubricant to be used in suitable synchronised manual gearboxes and final drive systems. This helps fleet operators, workshops and maintenance teams to simplify lubricant inventories and reduce the risk of incorrect oil selection.
This multipurpose manual transmission and final drive lubricant is part of the wider Castrol Syntrax range, which includes lubricants designed for different axle and drivetrain requirements.
Castrol Syntrax Universal Plus 75W-90 provides excellent lubrication across a wide operating temperature range. Its outstanding low-temperature fluidity improves gearshift quality during cold starts and maintains effective wear protection over the whole drain interval. This can contribute to improved fuel efficiency and smoother transmission operation, particularly when vehicles are operating in colder conditions.
At higher operating temperatures, the lubricant demonstrates superior thermal stability even under arduous conditions. These characteristics protect critical transmission and limited slip differential components, extend equipment service life and support longer oil drain intervals. In turn, this makes Syntrax Universal Plus 75W-90 a more cost-effective option than similar products, with reduced maintenance and oil-change requirements.
The lubricant is also fully compatible with conventional mineral oils and seals, allowing it to be considered for a broad range of applications where its specifications and approvals meet equipment requirements. Its fully synthetic formulation provides excellent lubrication performance and protection across a wide range of operating conditions, and because it is suitable for manual transmissions, final drives and differentials, it reduces the need to stock multiple lubricants.
Excellent cold-weather performance and low-temperature fluidity improve gearshift quality, wear protection and fuel efficiency at a range of temperatures. Syntrax Universal Plus 75W-90 also maintains reliable lubrication and wear protection under demanding high-temperature conditions, which makes the product suitable for the most demanding performance needs.
The product's formulation and excellent wear protection can prolong the service life of transmissions and final drive components, and support longer lubricant service intervals. It is compatible with conventional mineral oils and seals, which increases application flexibility and satisfies multiple applications in a single lubricant.
Castrol Syntrax Universal Plus 75W-90 is designed for use in synchronised manual transmissions and final drives or differentials where API GL-4 or API GL-5 fluids are specified. Its versatility makes it particularly suitable for commercial vehicle fleets, passenger vehicles and construction machinery that require a high-performance synthetic transmission lubricant.
Broughton Lubricants also supplies an extensive selection of Castrol gear oils, including the Castrol Transmax Manual range for manual transmission applications and Castrol off-highway transmission oils for specialist machinery and equipment.
With decades of experience supplying specialist lubricants, Broughton Lubricants offers access to high-quality Castrol products and a strong foundation of technical expertise that can enable you to get the most from your vehicle or fleet.
As the UK's only Castrol Ambassador Distributor for both industrial and automotive product lines, we have a strong track record of supplying expert guidance to help customers select the correct oils for their equipment and operating requirements. Our knowledgeable team can recommend suitable lubricants based on your specifications and, with our long-standing industry experience, we can identify direct replacements or alternatives for products that are no longer available. With lubricant products frequently discontinued, replaced, upgraded, reformulated or otherwise unavailable, our support can enable you to continue operating your fleet without interruption and, in many cases, deliver greater performance from your engines with high-quality gear oil and related products.
Whether you're maintaining a commercial fleet, servicing construction machinery or sourcing specialist transmission oils, contact Broughton Lubricants for dependable product advice and expert technical support. Call us on 03300 555 109 or use our online enquiry form to request a call back at your convenience.