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Performance Engine Oils
Castrol GTX Ultraclean 10W-40 A3/B4 Synthetic Technology Car Engine Oil

Castrol GTX Ultraclean 10W-40 A3/B4 Synthetic Technology Car Engine Oil


Castrol GTX 10w-40 A3/B4 - 1 Litre

1 Litre


Castrol GTX 10w-40 A3/B4 - 4 Litres

4 Litres


Castrol GTX 10w-40 A3/B4 - 5 Litres

5 Litres


Castrol GTX 10w-40 A3/B4 - 20 Litres

20 Litres


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol GTX Ultraclean 10W-40 A3/B4 Synthetic Technology Car Engine Oil

General Details:

OilPart Synthetic Oil
Oil Viscosity Classification SAE10W-40
Packing TypeBottle
Content [litre]4
Manufacturer ApprovalFIAT 9.55535-D2
Manufacturer ApprovalFIAT 9.55535-G2
Manufacturer ApprovalMB 229.1
Manufacturer ApprovalRenault RN 0700
Manufacturer ApprovalRenault RN 0710
Manufacturer ApprovalVW 501 01 / 505 00
SpecificationACEA Light Duty A3/B
SpecificationAPI Gasoline SN

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Sludge can block your engine's vital oilways like cholestrol, and if left untreated it can rob an engine of power and, ultimately, its life.

Castrol GTX Ultraclean features synthetic technology for a superior performance. Its Double Action formula cleans away old sludge, and protects against new sludge formation better than tough industry standards.

Difficult operating conditions, increased operating temperatures and poor fuel quality can promote the formation of deposits in the engine oil circuit. GTX Ultraclean offers outstanding performance in terms of engine cleanliness; preventing deposits and dissolving existing deposits through its exceptional detergent additive.
Help extend the life of your engine with Castrol GTX Ultraclean.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • High performance multi-range engine oil based on mineral oil with synthetic components for petrol and diesel engines
  • Provides 50% better engine cleanliness compared to the current API Industry Test
  • Advanced protection against viscosity and thermal breakdown
  • Superior protection against deposition due to high temperatures
  • Premium quality base oils and anti-wear additives that help extend the life of your engine
  • Low oxidation tendency at high temperatures


  • ACEA A3/B3, A3/B4
  • API SN 
  • Meets Fiat 9.55535-D2, 9.55535-G2
  • MB-Approval 229.1
  • Renault RN 0700/RN 0710
  • VW 501 01/ 505 00


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: Synthetic Technology