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Castrol MAGNATEC 5W-40 C3 Fully Synthetic Car Engine Oil

Castrol MAGNATEC 5W-40 C3 Fully Synthetic Car Engine Oil


Castrol Magnatec 5W-40 C3 - 1 Litre

1 Litre


Castrol Magnatec 5W-40 C3 - 4 Litres

4 Litres


Castrol Magnatec 5W-40 C3 - 20 Litres

20 Litres


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol MAGNATEC 5W-40 C3 Fully Synthetic Car Engine Oil

General Details:

Content [litre]4
Packing TypeBottle
Oil Viscosity Classification SAE5W-40
SpecificationACEA C3
SpecificationAPI SN
OilSynthetic Oil
Manufacturer ApprovalMB-Freigabe 229.31
Manufacturer ApprovalBMW Longlife-04
Manufacturer ApprovalFiat 9.55535-S2
Manufacturer ApprovalRenault RN0700
Manufacturer ApprovalRenault RN0710

Traffic congestion has increased dramatically; today even a normal driver can stop and start up to 18,000 times a year*. That’s annoying, but worse, it slowly damages your engine – permanently.

Uniquely, Castrol’s breakthrough MAGNATEC DUALOCK molecules cling to critical engine parts and lock together to:

  • Form a powerful force field of protection 
  • Dramatically reduce both warm-up** and stop-start wear by 50%*** 
  • Offer non-stop protection from every start.
Castrol MAGNATEC 5W-40 C3 has been specially formulated to deliver outstanding protection for the latest engines fitted with after treatment devices such as diesel particulate filters and 3 way catalysts.

* Global average from 50 cities, Castrol MAGNATEC STOP-START Index 2014
** Tested vs the API SN wear limit in the Sequence IVA test.
*** Tested versus the ACEA wear limit in the OM646LA test.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • Provides continuous protection for all driving conditions, styles and temperatures
  • Delivers superior performance under extreme cold start up conditions
Castrol Magnatec’s DUALOCK Molecules;
  • Form a powerful force field of protection 
  • Dramatically reduce both warm-up and stop-start wear 
  • Offer non-stop protection from every start


  • ACEA C3
  • API SN
  • Meets - Fiat 9.55535-S2
  • BMW Longlife-04
  • MB-Approval 229.31
  • Renault RN 0700 / RN 0710


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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Brand: Castrol
Oil Type: Fully Synthetic
DPF Compatible: Yes

DPF Compatible

This Engine Oil is DPF (diesel particulate filter) Compatible.

What’s a DPF?