CASTROL MAGNATEC 5W-40 A3/B4
Castrol MAGNATEC 5W-40 A3/B4 is a fully synthetic engine oil developed for modern petrol and diesel engines. A high-performance 5W-40 lubricant that meets ACEA A3/B4 specifications, MAGNATEC 5W-40 A3/B4 excels at offering non-stop protection for critical engine parts under even the most challenging operating conditions.
Designed with Castrol’s MAGNATEC technology, the oil contains molecules that adhere to engine components and form a protective layer that remains in place even when the engine is switched off. A large proportion of engine wear occurs during start-up, but Castrol MAGNATEC 5W-40 A3/B4 offers non-stop protection from every start up.
Product performance claims
Castrol MAGNATEC 5W-40 A3/B4 is suitable for use in automotive petrol and diesel vehicles where the manufacturer recommends an ACEA A3/B4, API SP or earlier specification 5W-40 lubricant.
- ACEA A3/B4
- API SP or API SN/CF
- MB-Approval 229.3 / 229.5
- Renault RN0700 / RN0710
- VW 502 00 / 505 00
Why Choose Castrol?
Formulated to provide protection across a wide range of operating temperatures, Castrol MAGNATEC 5W-40 A3/B4 maintains oil film strength under demanding driving conditions while also delivering rapid circulation during cold starts. The product is optimised for modern driving conditions, and its fully synthetic formulation supports improved engine cleanliness and wear control. It contributes to both consistent performance in everyday driving and more demanding operating environments.
MAGNATEC 5W-40 A3/B4 clings to engine parts and creates a resistive barrier between metal contact points in the valvetrain to prevent starting and stopping from slowly damaging your engine. It manages abrasive piston deposits, guards against cylinder liner wear, protects engine bearings from corrosion and maintains timing chain tension and engine synchronicity by minimising chain damage and elongation.
The oil is suitable for use in automotive petrol and diesel engines where the manufacturer recommends a lubricant meeting ACEA A3/B4 or A3/B3 specifications, or API SN/CF performance levels, in the SAE 5W-40 viscosity grade. It is approved or recommended for use in a range of vehicles from leading manufacturers and supports extended engine protection in both high-temperature and low-temperature operating conditions.
Castrol MAGNATEC technology works by bonding to metal surfaces within the engine. This provides continuous protection, including during periods when the oil normally drains away from components after shutdown. The protective film helps reduce metal-to-metal contact during start-up and contributes to improved durability of key engine parts such as the valvetrain, piston assemblies, and bearings.
Why Choose Broughton Lubricants?
At Broughton Lubricants, our long-standing expertise as the UK’s only Castrol Ambassador Distributor for both the automotive and industrial product ranges allows us to assist customers to select the correct lubricant for their application. With over 100 years of experience in the industry, we can offer guidance on compatibility with your vehicle or equipment based on your technical specifications.
Where lubricant products have been discontinued, replaced, rebranded or upgraded, we can help you to identify these products or recommend a replacement or alternative based on our thorough understanding of technical specifications. Call our team today to learn more about how we can help on 03300 555 109, or use our online enquiry form to get in touch.