ZF Lifeguard Fluid 6 ATF – 6HP Automatic Gearbox Oil 1L | TYK500050G
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ZF Lifeguard Fluid 6 is the dedicated semi-synthetic automatic transmission fluid developed by ZF for compatible 6HP automatic gearboxes. Its friction characteristics are matched specifically to the transmission, helping maintain smooth shift quality and vibration-free operation while providing the thermal and oxidation stability needed inside a hard-working automatic gearbox. For Land Rover 6-speed ZF fitments using TYK500050, this is the ZF-branded fluid from the manufacturer of the transmission itself.
The 6HP is not a gearbox to fill with a generic ATF simply because the viscosity looks similar. Fluid friction behaviour forms part of the way the clutches and hydraulic control system operate, and ZF specifies Lifeguard Fluid 6 for the relevant 6HP transmission families.
Land Rover Fitment
- Discovery 3 – models fitted with the ZF 6HP automatic gearbox
- Discovery 4 – models fitted with the ZF 6HP automatic gearbox
- Range Rover Sport L320 – models fitted with the ZF 6HP automatic gearbox
- Range Rover L322 – models fitted with the ZF 6HP automatic gearbox
Later vehicles in these model ranges can use ZF 8HP automatic transmissions, which require a different fluid. Confirm the gearbox type before ordering rather than selecting the ATF from the vehicle model alone.
ZF 6HP Oil Change
Despite the familiar lifetime-fill wording associated with these transmissions, ZF currently recommends an oil change after 150,000 km – approximately 93,000 miles. ZF also states that shorter intervals can make sense where the gearbox has operated under high temperatures or heavy loads, or where the vehicle’s previous use and service history are unknown.
ZF specifies that containers up to 20 litres should be shaken vigorously for at least 15 seconds before the oil is dispensed.
Technical Specifications
| Property | Data |
|---|---|
| Product | ZF Lifeguard Fluid 6 |
| ZF product number | S671.090.255 |
| Container size | 1 litre |
| Base oil | Semi-synthetic |
| Colour | Amber |
| Density at 15°C | 840 kg/m³ |
| Viscosity at 40°C | 26.8 mm²/s |
| Viscosity at 100°C | 5.6 mm²/s |
| Brookfield viscosity at -40°C | 8,500 mPa·s |
| Pour point | -51°C |
| Flash point (COC) | 210°C |
Related Gearbox Service Parts
For sump, filter and other automatic gearbox servicing components, see our Gearbox & Transmission Service Kits. Other automatic transmission and hydraulic fluids are available in ATF & Steering Fluid.
| Weight | 0.9 kg |
|---|---|
| Dimensions | 30 × 15 × 10 cm |
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Standard UK shipments are normally sent with DPD. UK orders containing oils or fluids are normally sent with DHL where required, because some carriers restrict liquid shipments.
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- Changed your mind within 14 days? UK and EEA consumers have statutory cancellation rights. Tell us within 14 days of receiving your order, then return the goods within the following 14 days.
- Need longer? Eligible products can be returned under our voluntary extended returns policy. Contact us within 60 days of delivery and, once the return has been agreed, send the goods back within 14 days.
- Extended returns must be unused, unfitted, complete and suitable for resale as new. Goods must be undamaged, unmarked and uncontaminated, with all components and accessories supplied and their original product packaging where this formed part of the supplied product.
- A £10 handling charge applies to extended returns. This is charged once per return consignment, regardless of how many eligible products are returned together. It does not apply where your statutory cancellation rights apply.
- Return carriage and safe packing are your responsibility for change-of-mind returns.
- Managed UK returns: where suitable, we can provide a convenient prepaid tracked return service with straightforward drop-off, proof of handover and tracking linked to your return. The cost will be advised before it is arranged and may be deducted from your refund.
- Please do not fit or attempt to fit a part unless you intend to keep it. Fitting, attempted fitting, contamination, damage or excessive handling can substantially reduce the value of the goods. A product which has been fitted or used will not normally qualify for our voluntary extended returns policy.
- Faulty, damaged or incorrectly described? Contact us first. We will advise the appropriate return method and will normally provide a prepaid return service or cover reasonable agreed return costs.
Returns – quick FAQs
How long do I have to return an item?
For UK and EEA consumers, statutory change-of-mind cancellation rights also apply: tell us within 14 days of receiving your order, then return the goods within the following 14 days.
Which products qualify for 60-day returns?
Products purchased for £250 or more are not automatically covered, although we may agree to accept them for return at our discretion. Eligibility is based on the price of each individual product rather than the total order value.
Is there a charge for an extended return?
This charge does not apply where the return is being made under your statutory cancellation rights.
Who pays return carriage?
If an item is faulty, damaged or incorrectly described, contact us first. Where return is reasonably required, we will normally provide a prepaid return service or cover reasonable return costs agreed with us.
What condition must an extended return be in?
Can I fit a part and then return it?
Once a part has been fitted or an attempt has been made to fit it, it may be marked, contaminated, damaged or otherwise unsuitable for resale as a new part. Fitted or used goods will not normally qualify for our voluntary extended returns policy.
Where statutory cancellation rights apply, handling beyond what is reasonably necessary to inspect the goods may result in a reduction to your refund if it has reduced their value.
What if the item is faulty?
Are any items excluded from 60-day returns?
Extended returns must also meet the condition requirements above. Statutory exclusions and any separate statutory rights continue to apply as set out in our full Terms & Conditions.
How do I start a return?
Please include your order number and a brief reason for the return. Do not send anything back until you have received the appropriate return instructions.
Buy with confidence: all new parts sold by Twinwoods 4x4 include at least 12 months manufacturer warranty against defects in materials and workmanship under normal use.
Some products and brands may include a longer warranty period where this is provided by the manufacturer. Where applicable, this will normally be stated on the individual product page or covered by the manufacturer’s own warranty terms.
Warranty cover applies to manufacturing defects. It does not cover misuse, incorrect fitting, competition use unless stated, contamination, modification, damage during installation, normal wear and tear, or failure caused by an unrelated vehicle fault. For certain components, proof of professional fitment may be required.
Warranty claims may require the part to be returned for inspection and/or supplier testing before the claim is accepted. Any advance replacement is discretionary.
Warranty remedies relate to the part itself, meaning repair or replacement, or refund if those are not possible. Warranty does not cover labour, removal or refitting, diagnostics, consumables, travel or other incidental costs.
This warranty is in addition to your legal rights and does not reduce those rights.
For full details, please see our Terms and Conditions.


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