Replacing the spark plugs on a petrol Land Rover is a job most competent home mechanics can do in an afternoon — but only on the petrol V6 and V8 engines. If you own a diesel Land Rover you have no spark plugs at all (more on that below).
On a supercharged 3.0 V6 or 5.0 V8, budget roughly two to three hours, a set of eight or six iridium plugs, and a bit of patience getting past the intake plumbing. Do it yourself and you'll spend around R1,800–R3,500 on parts; a workshop will charge R3,500–R6,000 all-in. Here's exactly how we do it, the correct plug and gap, the torque figure, and when to change them.
- Only petrol Land Rovers have spark plugs — the supercharged 3.0 V6 and 5.0 V8. Diesel models (TDV6, SDV8) use glow plugs and never need spark plugs.
- Use the correct iridium plug (NGK SILZKAR7E8S / part LR032080 for the 5.0 V8) and check the gap — roughly 0.7–0.8 mm from the factory.
- Torque matters: about 20–21 Nm on the plugs and only ~7 Nm on the coil bolts — over-tightening cracks the ceramic or strips the alloy head.
- Change interval is roughly 90,000–100,000 km on iridium plugs; supercharged engines are harder on plugs, so don't stretch it.
- The awkward part is access — the intake manifold and coolant lines sit over the plugs on the V6, so most of the time is spent getting to them, not swapping them.
Which Land Rovers actually have spark plugs?
This trips people up constantly, so let's clear it up first. Spark plugs are only fitted to petrol engines. In the modern Land Rover range that means the supercharged 3.0-litre V6 petrol (the AJ126) and the 5.0-litre supercharged V8 — the engines you'll find in the petrol Range Rover Sport, Range Rover and later Discovery models. These use six or eight plugs respectively, one per cylinder, fired by individual coil packs.
Diesel Land Rovers — the hugely common TDV6 and SDV8 — do not have spark plugs at all. A diesel ignites its fuel by compression, so instead it has glow plugs, which only warm the cylinders for cold starting and are a completely different service item. If someone quotes you for "spark plugs" on a diesel Disco or Defender, they've made a mistake. So before you buy anything, confirm you have a petrol engine.
What you'll need
This is a straightforward parts list, but buying the right plug is the whole game — the wrong heat range or gap will run poorly and can foul under boost. Here's the kit for a petrol V6 or V8:
- Spark plugs — a set of 6 (3.0 V6) or 8 (5.0 V8) genuine or NGK iridium plugs. For the 5.0 SC V8 that's NGK SILZKAR7E8S (Land Rover part LR032080); the 3.0 V6 uses the matching JLR iridium plug.
- Coil packs — inspect while you're in there; replace any that are cracked, oil-fouled or throwing a misfire code from our petrol engine parts range.
- A 3/8" torque wrench, a thin-wall spark plug socket (usually 14 mm), a short extension and a swivel/wobble joint for the tight corners.
- T30 and T27 Torx bits, a set of trim tools, and a little dielectric grease for the coil boots.
- A workshop manual or the correct torque figures, plus a fault-code reader to clear any stored misfire codes afterwards.
Step-by-step: changing the plugs on a supercharged V6/V8
Work on a cold engine — hot alloy heads are far easier to cross-thread or strip. Here's the sequence we follow in the workshop:
- Disconnect the battery and let the engine cool fully. Pop the bonnet and remove the engine covers.
- Gain access. On the 3.0 V6 the intake plumbing and a couple of coolant lines sit over the plugs. Rather than draining coolant, push the foam insulation down and use a T30 Torx to release the bracket holding the lines, then move them aside. On the 5.0 V8 the outer plugs are reachable; the inner bank needs a little more manoeuvring.
- Remove one coil pack at a time. Unclip the grey retainer, unplug the connector, undo the single bolt (T27) and pull the coil straight up. Working one cylinder at a time stops you mixing up firing order.
- Blow out the plug well with compressed air so no grit drops into the cylinder, then loosen the old plug with the socket and extension.
- Check the new plug gap against spec (roughly 0.7–0.8 mm) before fitting. Most iridium plugs come pre-gapped — check, don't force.
- Fit by hand first. Thread each plug in by hand to avoid cross-threading the alloy head, then torque to about 20–21 Nm. Do not guess — over-torque cracks ceramic and strips threads.
- Refit the coil with a smear of dielectric grease on the boot, torque the coil bolt lightly (~7 Nm), reconnect and clip the retainer. Repeat across all cylinders.
- Reassemble, reconnect the battery, clear codes and run the engine to check for a smooth idle and no misfire.
Land Rover Petrol Spark Plugs & Coils
Correct iridium plugs and tested coil packs for the 3.0 SC V6 and 5.0 SC V8 — matched to your exact engine so you don't fit the wrong heat range. Send us your VIN and we'll confirm the part.
Get a QuoteHow much does a spark plug change cost in SA?
Here's a realistic guide to what a petrol Land Rover plug service runs in 2026, using quality genuine or NGK iridium plugs and tested used or reconditioned coils where needed. Actual figures depend on your engine (six plugs versus eight), labour rates and whether you tackle it yourself. These are indicative ranges only, not quotes.
| Item | Typical price (genuine / recon) | Notes |
|---|---|---|
| Iridium plug set (6 – V6) | R1,800 – R3,000 | Full set, genuine or NGK |
| Iridium plug set (8 – V8) | R2,400 – R3,500 | NGK SILZKAR7E8S / LR032080 |
| Coil pack (each) | R900 – R2,200 | Replace only faulty ones |
| Workshop labour | R1,500 – R3,000 | 2–3 hrs, access is the work |
| DIY total (plugs only) | R1,800 – R3,500 | Your time, no labour |
| Fitted total (workshop) | R3,500 – R6,000 | Vs R8,000+ at a dealer |
Tips, warnings and the mistakes to avoid
A plug change is simple in principle but there are a handful of ways to turn it into an expensive mistake. The biggest is over-torquing: these engines have aluminium heads, and a stripped plug thread means a helicoil repair or worse. Always start each plug by hand and finish with a torque wrench, not a rattle gun. Second, never drop grit into an open cylinder — blow the wells clean first.
Watch for a persistent misfire after the job. If one cylinder stumbles, it's usually a tired coil rather than the new plug — swap that coil to a different cylinder and see if the misfire follows it.
On high-mileage supercharged engines we often recommend doing plugs and any weak coils together, so you're not back in there in a month. If your Land Rover is due other petrol servicing, it's a sensible time to sort an engine oil and filter change in the same session while everything is apart.
When should you change Land Rover spark plugs?
For the iridium plugs fitted to the supercharged petrol V6 and V8, the sensible interval is around 90,000 to 100,000 km, though some newer JLR schedules call for a change sooner.
Supercharged engines run higher cylinder pressures than a naturally aspirated motor, which is harder on plugs, so we'd err on the earlier side rather than stretch a set to the limit. If you tow a caravan or trailer regularly — and plenty of Range Rover Sport owners here do — the plugs work harder still.
Don't wait for a total misfire before acting. The early signs of tired plugs are a slightly rougher idle, hesitation under hard acceleration, poorer fuel economy and the occasional stumble when cold. A stored misfire fault code is your clearest warning.
Fresh plugs on a supercharged Land Rover restore crisp throttle response and can noticeably improve economy — a cheap service item with a real payoff. If you're also chasing rough-running or economy faults, our guide to replacing a faulty oxygen sensor covers another common culprit.
Range Rover Sport Petrol Engine Parts
Coils, plugs, HT components and supercharger service items for the petrol Range Rover Sport — matched to your VIN. Nationwide delivery across South Africa.
Get a QuoteBefore you buy parts
A petrol Land Rover can keep misfiring with a fresh set of plugs already in it. Plugs are the right place to start because they are the cheapest part in the chain, but on the V8s the coils sit directly on top of them and age out with heat. Swap the coil from the misfiring cylinder to a healthy one: if the misfire moves with it, the coil is your fault, not the plug. The plugs are out either way, so fit the correct set and sort the coils in the same session rather than opening it twice.
Need Land Rover spark plugs or coils? Get a quote.
We supply genuine petrol Land Rover ignition parts across South Africa — iridium spark plugs, coil packs and HT components for the 3.0 SC V6 and 5.0 SC V8 — with nationwide delivery. Send us your VIN and the part you need.
Frequently asked questions
Do diesel Land Rovers have spark plugs?
No. Diesel Land Rovers — the TDV6, SDV8 and the older Td5 — ignite their fuel by compression, so they have no spark plugs. Instead they use glow plugs, which only warm the cylinders to help cold starting. If a diesel Discovery or Defender is running rough, the fault is elsewhere (injectors, EGR, turbo), not the plugs. Only the petrol supercharged V6 and V8 engines have spark plugs.
Which spark plug does the Range Rover Sport 5.0 V8 use?
The 5.0-litre supercharged V8 uses an NGK iridium plug, SILZKAR7E8S, sold under Land Rover part number LR032080, in a set of eight. The 3.0 supercharged V6 uses the matching JLR iridium plug in a set of six. Always confirm against your VIN before buying — fitting the wrong heat range will run poorly, especially under boost. Send us your VIN and we'll match the exact plug.
What is the spark plug gap and torque for a supercharged Land Rover?
The factory gap is roughly 0.7 to 0.8 mm depending on the exact engine, and most iridium plugs come correctly pre-gapped — check but don't force them. Torque the plugs to about 20 to 21 Nm and the coil bolts only lightly, around 7 Nm. Over-tightening is the number-one mistake: it cracks the ceramic and can strip the aluminium head thread.
How often should I change the spark plugs?
On the iridium plugs fitted to the petrol V6 and V8, plan on roughly every 90,000 to 100,000 km. Supercharged engines are harder on plugs, so if you tow or do a lot of hard driving, change them a little sooner rather than stretching the interval. Signs they're due include a rough idle, hesitation, poorer economy and a stored misfire code.
Can I change Land Rover spark plugs myself?
Yes, if you're a competent home mechanic. The plugs themselves are easy — the awkward part is access, especially on the 3.0 V6 where the intake plumbing and coolant lines sit over them. Budget two to three hours, use a torque wrench (not a rattle gun), start every plug by hand, and clear any codes afterwards. If you're unsure about the alloy head threads, let a workshop do it.
How much does a spark plug change cost in South Africa?
A DIY plug change costs around R1,800 to R3,500 in parts for a full set. Fitted at an independent workshop, expect R3,500 to R6,000 all-in, versus R8,000 or more at a main dealer. Replacing tired coils at the same time adds R900 to R2,200 each. Buying genuine or NGK plugs and tested coils from a specialist keeps a petrol Land Rover running sweetly for far less than dealer pricing.
Sources
- NGK — correct spark plug installation and torque guidance: ngksparkplugs.com
- Honest John — Range Rover Sport owner-reported good and bad points: honestjohn.co.uk