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Castrol Transmax Dex III Multivehicle Car Automatic Gearbox Oil (ATF) - Formerly TQ DIII

Castrol Transmax Dex III Multivehicle Car Automatic Gearbox Oil (ATF) - Formerly TQ DIII

Castrol Transmax Dex III - 1 Litre

1 Litre


Castrol Transmax Dex III - 20 Litres

20 Litres


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  • Description
  • Benefits
  • Specifications
  • Technical Info
  • Shipping Explained

Castrol Transmax Dex III Multivehicle Car Automatic Gearbox Oil (ATF) - Formerly TQ DIII

General Details:

OilPart Synthetic Oil
Manufacturer ApprovalAllison C4
Manufacturer ApprovalAllison TES 389
Manufacturer ApprovalFord MERCON
Manufacturer ApprovalGM Dexron IIIH
Manufacturer ApprovalMAN 339 Typ V1
Manufacturer ApprovalMAN 339 Typ Z1
Manufacturer ApprovalMB 236.9
Manufacturer ApprovalVoith H55.6335.xx
Manufacturer ApprovalVolvo 97340
Manufacturer ApprovalVolvo 97341
for components see parts list
Castrol Transmax Dex III Multivehicle is designed for use in GM automatic transmissions pre 2005 and Ford automatic transmissions built between 1983 and 1996 where Dexron® (II or III) or Mercon are required. This product is approved for use in Allison heavy duty transmissions against TES 389. It is also approved for use in a wide range of european heavy duty automatic transmissions. It may be used in some power steering units.

Castrol Transmax Dex III Multivehicle is the rebranded Castrol TQ DIII Automatic Transmission Fluid.

NB: Do not use where MERCON® V, MERCON® SP or DEXRON® VI is required.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


  • Multiple manufacturer approvals make Castrol Transmax Dex III Multivehicle ATF suitable for wide ranging use.
  • Transmax Dex III Multivehicle is specifically formulated for high thermal stability and resistance to oxidation which protects against the formation of deposits and oil thickening prolonging the life of components and lubricant.
  • Optimised friction characteristics provide smooth shifting and efficient power transfer.
  • High viscosity index provides a stable viscosity over a wide temperature range for effective protection of transmissions and operation of power steering units


  • Specifications
    • Allison C4
    • Allison TES 389
    • Ford Mercon
    • GM Dexron IIIH
    • MAN 339 Z1, V1
    • MB-Approval 236.9
    • Voith H55.6335.xx
    • Volvo 97340
    • Volvo 97341
    • ZF TE-ML 04D, 14A, 17C

Technical Information:

Density @ 15C, Relative (ASTM D4052) : 0.859 g/ml
Colour (ASTM D1500) : Red
Viscosity, Kinematic 100C (ASTM D445) : 7.2 mm²/s
Pour Point (ASTM D97) : -46°C
Viscosity, Brookfield @ -40C (ASTM D2983) : 16500 mPa.s (cP)
Viscosity, Kinematic 40C (ASTM D445) : 35mm²/s
Viscosity Index (ASTM D2270) : 175
Flash Point, COC ASTM D92 °C 216


SHIPPING IS FREE* for orders of £60 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 £4.99 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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