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Performance Engine Oils
Castrol MAGNATEC Stop-Start 5W-30 S1 Fully Synthetic Car Engine Oil

Castrol MAGNATEC Stop-Start 5W-30 S1 Fully Synthetic Car Engine Oil


Castrol Magnatec 5w-30 S1 - 1 Litre

1 Litre


Castrol Magnatec 5w-30 S1 - 4 Litres

4 Litres


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol MAGNATEC Stop-Start 5W-30 S1 Fully Synthetic Car Engine Oil

General Details:

OilSynthetic Oil
Packing TypeBottle
Oil Viscosity Classification SAE5W-30
Content [litre]4
Manufacturer ApprovalFIAT 9.55535-S1
SpecificationACEA Light Duty C2
SpecificationAPI Gasoline SN

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Busy driving, reinvented.

All cars, even those with the latest stop-start engine technology don’t perform at their best in traffic congestion. And congestion has dramatically increased over the past 10 years, causing engine wear and wasting fuel.

Castrol's new MAGNATEC STOP-START combines DUALOCK molecules with their most efficient full synthetic base oils. Uniquely, Castrol’s breakthrough MAGNATEC DUALOCK molecules cling to critical engine parts and lock together to:

  • Form a powerful force-field of protection against engine wear
  • Dramatically reduce both warm-up* and stop-start** wear by 50%
  • Offer non-stop protection and improved fuel economy*** from every start, even for vehicles with modern stop-start engine technology.

* Tested vs the API SN wear limit in the Sequence IVA test.
** Tested versus the ACEA wear limit in the OM646LA test.
*** Compared to an industry reference 15W-40 oil.

Castrol MAGNATEC STOP-START 5W-30 S1 is suitable for use in automotive petrol and diesel engines where the manufacturer recommends an ACEA C2; API SN or earlier specification 5W-30 lubricant.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


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 C2
  • API SN
  • Meets - Fiat 9.55535-S1


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?