Range Rover Sport L320 (2010–2013) Oil Change Guide: 306DT Specialist

A step-by-step oil service guide for the Range Rover Sport L320. Covers correct oil specification, engine-specific capacities, full procedure with torque specs, and the TDV6 sludge failure mode that causes catastrophic engine damage when servicing is neglected.

Engine Variants and Oil Capacities: L320 (2010 to 2013)

The Range Rover Sport L320 facelift range spans two diesel engine codes and two petrol variants. Oil capacities differ between them. Using an incorrect figure on the TDV6 or SDV6 risks underfilling by up to 2 litres, sufficient to drop oil pressure at the turbo bearing below safe operating levels under sustained load.

This guide covers the 3.0 TDV6 and SDV6 diesel variants (both share the 306DT engine block) in full. V8 petrol variants are out of scope and not covered here.

Fill method: Add approximately 80% of the total stated capacity on initial fill. Start the engine, idle for 2 minutes, shut off, wait 5 minutes, then check the dipstick and top up incrementally. The oil filter cartridge housing absorbs approximately 200 to 250 ml on first startup. Always recheck level after the initial run.

Correct Oil Specification for the TDV6 and SDV6

The 306DT in DPF-equipped EU specification requires fully synthetic 5W-30 meeting JLR specification STJLR.03.5005 (ACEA C1). This is a low-SAPS formulation and is not interchangeable with mid-SAPS or full-SAPS grades.

ACEA C1 (the basis of STJLR.03.5005) is a low-SAPS oil. Low-SAPS means low Sulphated Ash, Phosphorus and Sulphur. This matters for two reasons specific to the 306DT in EU specification:

• DPF protection: all EU 306DT models are fitted with a Diesel Particulate Filter. High-SAPS oils (such as ACEA A5/B5 or C3) leave ash residue that physically clogs the DPF over time, leading to DPF Full warnings, limp mode, and eventual filter replacement.
• Wet-timing-belt protection: the 306DT uses a Belt-in-Oil (wet belt) system driving the camshafts. The belt runs immersed in engine oil, and oil chemistry directly affects belt integrity. High-SAPS oils contain additives that chemically attack the rubber compound, causing the belt to degrade and shed debris into the sump. This debris then blocks the oil pick-up strainer, oil pressure drops, and bearing or crankshaft failure follows.

Climate and load guidance:

• 5W-30 STJLR.03.5005 (ACEA C1) is the correct specification for all standard EU operating conditions on DPF-equipped 306DT models
• If STJLR.03.5005 oil is genuinely unavailable, ACEA C2 (mid-SAPS) is acceptable as a short-term alternative until the next service. Do not use ACEA C3 or A5/B5 in a DPF-equipped 306DT
• Do not use any oil not listed on the STJLR.03.5005 approvals list, regardless of packaging claims

DPF and fuel dilution, EU city driving context:
All L320 306DT units sold in EU markets carry a DPF. Under short-cycle city driving, post-injection DPF regeneration events cause fuel wash-down of the cylinder walls, diluting engine oil over time. If the vehicle is primarily used for urban short trips, reduce the service interval to 10,000 km or 10 months and monitor oil level and condition between services. Oil that smells of fuel at the dipstick indicates active fuel dilution and must be changed immediately, irrespective of interval.

Wet Belt and Sludge: Why Oil Specification and Interval Are Critical

This section covers the most important failure risk associated with oil servicing on the 306DT. It is not optional reading.

The failure sequence on the 306DT:
The 3.0 306DT is documented for catastrophic oil-system failure caused primarily by degradation of the wet timing belt, with conventional sludge as a contributing factor. The mechanism is: incorrect oil specification or extended service intervals lead to chemical attack on the timing belt, the belt sheds rubber debris and delaminates over time, and that debris (often presenting as a black slurry alongside conventional carbon-soot sludge) progressively restricts the oil pick-up strainer, the mesh filter feeding the oil pump.

Once the strainer is partially blocked:

1. Oil pump output pressure drops, most critically at low rpm and idle
2. Main bearing oil film pressure falls, typically below 1.0 bar at warm idle in severe cases
3. The turbocharger oil feed, which operates at lower pressure than the main galleries, loses adequate flow
4. Bearing surfaces begin running metal-on-metal during warm-up and idle phases
5. At this stage, an oil change alone does not restore the engine. The pick-up strainer must be cleaned or replaced and bearing condition assessed before the engine is returned to service

Symptoms indicating sludge is already present:

• Metallic tapping at idle on cold start that clears slowly (longer than 60 seconds) as oil temperature rises, distinguishable from normal tappet noise by its persistence and lower frequency
• Oil pressure warning illuminating at idle or low speed, clearing above 1,500 rpm
• Oil consumption exceeding 0.5 litres per 1,000 km without visible external leaks
• Oil at the dipstick appearing black and thick within 5,000 km of a previous service

Prevention:

• STJLR.03.5005 (ACEA C1) low-SAPS oil only, changed at a maximum of 12 months / 12,000 to 15,000 km dependent on use profile
• Ensure the engine reaches full operating temperature regularly. Minimum 20-minute runs; avoid sustained short-trip use without compensating with shortened intervals
• Do not use engine flush additives in a sludge-affected 306DT. Flushing agents can dislodge deposits acutely and cause immediate strainer blockage. If sludge is suspected: change oil and filter, measure oil pressure at warm idle with a gauge (minimum 1.0 to 1.5 bar), and inspect the pick-up strainer at the next available sump-off opportunity

What You Need: Tools and Parts for the L320 Oil Service

Parts required:

Tools required:

Step-by-Step Oil Change Procedure for the L320

Step 1, Scan for Fault Codes Before Starting

Connect a diagnostic scanner and check for stored codes before touching the engine. Pay particular attention to P0520 (oil pressure sensor circuit malfunction) and P0522 (oil pressure sensor low voltage). If either code is present before the service, an oil change will not resolve them. Document all fault codes and investigate the cause separately.

Step 2, Warm the Engine to Draining Temperature

If the engine is cold, run for 5 minutes to warm the oil to a draining temperature. If the vehicle has been driven recently, allow it to cool for 10 to 15 minutes before starting. Oil at full operating temperature exceeds 110°C and will cause serious scalding burns. Warm oil carries suspended contaminants and drains more completely than cold oil; very hot oil is a safety hazard.

Step 3, Raise and Level the Vehicle

Park on a level surface and apply the parking brake. Raise the vehicle using a jack and axle stands, or use an inspection pit. Confirm the vehicle sits level. The L320 sump drain is positioned such that a nose-high stance traps oil in the forward sump section and prevents full drainage.

Step 4, Remove the Undertray

Using a 10 mm socket, remove the undertray retaining bolts and lower the undertray carefully. The retaining clips on older L320 vehicles are brittle. Inspect their condition on removal and replace any that have cracked. Set the undertray aside to expose the oil sump and surrounding area.

Step 5, Position the Drain Pan and Remove the Sump Plug

Position the drain pan beneath the sump drain point, offset slightly toward the rear. Oil exits at an angle and will miss a centrally placed pan. Using a 19 mm socket, carefully break the drain plug loose.

Allow the plug to fall into the pan if needed. Attempting to catch it with one hand in the path of hot oil flow risks burns. Inspect the drain plug threads for damage. If the thread is worn or the plug has been previously over-torqued, address before refitting.

Step 6, Allow Full Drainage

Allow the engine to drain for a minimum of 20 to 30 minutes. The TDV6 sump geometry retains a volume of oil in suspension above the pan for several minutes after initial flow stops. Ending drainage prematurely dilutes the fresh oil charge.

Step 7, Remove the Oil Filter Cartridge

The oil filter on the 306DT is a cartridge-type element housed in a plastic cap, accessed from above the engine, not from underneath. Using the 76 mm 14-flute cap socket, remove the housing cap. Extract the old filter element and set it aside. Remove and discard the old housing O-ring. Do not reuse the O-ring. A failed O-ring is the most common cause of post-service oil weep from the filter housing.

Step 8, Install the New Filter Element and O-Ring

Fit the new cartridge element into the housing. Lightly lubricate the new O-ring with clean engine oil and seat it fully into the housing groove. Thread the housing cap in by hand to confirm correct engagement. Do not start with a tool. Torque the housing cap to 25 Nm. Do not exceed this figure. The housing cap is plastic and a single over-torque event will crack it, requiring replacement of the entire housing assembly.

Step 9, Refit the Sump Drain Plug

Clean the sump drain threads. Fit a new aluminium sealing washer. Reusing the old washer risks a weeping joint and is not acceptable practice. Thread the drain plug in by hand first to confirm the thread seats correctly, then torque to 25 Nm. The sump on the TDV6 and SDV6 is aluminium alloy. Over-torquing strips threads. If the plug feels loose on hand-start, stop and inspect the threads before torquing.

Step 10, Fill with Engine Oil

Remove the oil filler cap and add approximately 80% of the service fill as an initial pour, which is around 4.8 litres for the 306DT. Do not pour the full bottle. Check the level on the dipstick (or electronic sensor) with the vehicle on a level surface, then top up incrementally. Verify total capacity against your vehicle's handbook before final top-up.

Use only oil meeting STJLR.03.5005 (ACEA C1).

Refit the filler cap. Do not start the engine until the filler cap is secured.

Step 11, First Start and Oil Pressure Check

Start the engine and allow it to idle. The oil pressure warning lamp may illuminate for 2 to 5 seconds as the filter housing and oil galleries prime. This is normal.

Allow the engine to idle for 2 minutes. Shut off and wait 5 minutes for oil to drain back to the sump.

Step 12, Final Oil Level Check and Leak Inspection

Check the dipstick with the vehicle on a level surface. The level will typically read in the lower half of the MIN-MAX zone after the first idle cycle. The cartridge filter housing has absorbed approximately 200 to 250 ml. Top up in 250 ml increments until the level sits in the upper half of the MIN-MAX operating zone. Do not fill to MAX. A vehicle on even a slight incline can give a false low reading and tempt a dangerous final top-up.

Inspect the drain plug, filter housing cap, and surrounding sump area for any seepage. Wipe all surfaces clean with a lint-free cloth so any new seepage is immediately visible on the post-service drive. Refit the undertray and torque the retaining bolts to 10 Nm.

Reset the oil service reminder (see section below) and confirm hood closure before returning the vehicle to use.

L320 Oil Service Torque and Specification Reference

Oil capacities (with filter change):

Oil Service Interval for the Range Rover Sport L320

The JLR OEM service schedule specifies 15,000 miles (24,000 km) or 12 months, whichever is reached first. For the 306DT, specialist consensus, supported by documented wet-belt and sludge failure patterns, is that this interval is too long under mixed or city-dominated use.

The TDV6 and SDV6 share the same 306DT block and carry identical DPF fuel-dilution and wet-belt risks under short-cycle use. Apply the same interval logic for both diesel variants.

Inspect These Components While the Undertray Is Off

The L320 oil service provides direct access to several adjacent components that are expensive to miss and directly linked to long-term oil system health.

Oil cooler housing seals: The 306DT uses an oil-to-coolant heat exchanger. The rubber seals on this housing are a known wear item on higher-mileage units. A failed internal seal causes oil contamination of the coolant; a failed external seal causes oil loss at the housing face. Inspect for oil residue or coolant discolouration around the cooler at every service.

Rocker cover gasket: The 306DT rocker cover is prone to gasket weep, presenting as an oil film along the lower edge of the cover. Trace weeping is not an emergency but will worsen progressively. Confirm no active drip is present and record condition for monitoring.

Crankcase breather hose: The 306DT's crankcase breather accumulates oil sludge internally over time. A restricted breather elevates crankcase pressure, which forces oil through gasket faces and oil seals throughout the engine. Trace the breather hose from the rocker cover and confirm it is free of collapse, cracking, and heavy oil deposit at connection points.

Sump area, previous repair indicators: Check for RTV sealant around the sump face or signs of a previous sump-drop. Either is a material indicator of prior oil starvation investigation or pick-up strainer work and should be noted in the vehicle's service record.

Diagnosing Oil-Related Symptoms on the TDV6 and SDV6

Resetting the Oil Service Reminder on the L320

The reset procedure differs between instrument pack variants across the 2010 to 2013 L320 range.

Pre-facelift and early facelift L320, trip stalk method:

1. Switch ignition to position II (dashboard illuminated, engine off)
2. Use the trip reset stalk on the steering column to navigate to the service interval display
3. Press and hold the reset button for approximately 5 seconds until the display resets to the new interval figure
4. Confirm the new interval is displayed before switching off

Later facelift L320 with full instrument menu:

1. Navigate to Vehicle Settings via the instrument cluster menu
2. Select Service, then Reset Service Interval
3. Confirm the reset when prompted

If neither method resets the counter, or the display does not respond, the service interval module requires reset via a compatible diagnostic scan tool through the instrument cluster.

Frequently Asked Questions

Updated: 5 May 2026

Disclaimer: This guide is provided for informational purposes only. While every effort has been made to ensure accuracy, the information contained here does not replace the official Land Rover workshop manual or the advice of a qualified technician. Engine specifications, capacities, and torque values should always be verified against your vehicle's handbook before carrying out any work. Budget Parts / roverparts.eu accepts no liability for damage to vehicles, property, or injury to persons arising from work carried out in reliance on this guide. If you are in any doubt about your ability to complete this procedure safely, consult a qualified mechanic.