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Most common fit — MG HS: NGK ILNAR8B7G — gap 0.7 mm, 4 needed. Search on Amazon
Spark plugs are set by the engine, not the model badge — the full per-engine breakdown, the diesel and electric variants and our sourcing notes are below.
Spark Plug Specifications
No single spark plug covers the MG HS. The table below gives the plug for each engine in the range, because the plug follows the engine, not the model badge. Check which engine you have before ordering — the parts are not interchangeable, and on several cars in this class the gap differs too.
| Engine | Spark plug | Electrode gap | Plugs needed | OE number |
|---|---|---|---|---|
| 1.5T (engine code 15E4E) | NGK ILNAR8B7G (91970) | 0.7 mm | 4 | 10427930 |
| PHEV | No data available — the engine code could not be confirmed | — | — | No data available |
Recommended Spark Plugs for MG HS
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- The 1.5T figure is confirmed three ways: a parts-catalogue listing, the Champion cross-reference OE258 and the Bosch cross-reference 0 242 145 606.
- Commonly mis-listed: Bosch FR7NPP332, a BMW six-cylinder part with no MG application.
Checked against: NGK, Denso, Bosch and Champion catalogue data via the TecDoc-derived application database, cross-checked against manufacturer OE numbers where those are published.
A note on quantity: the catalogue quantity field is unreliable — it prints 4 for a number of three-cylinder engines. The quantities in the table above have been corrected to the actual cylinder count.
Engine Family Key
Stellantis uses three different plugs across the 1.2 PureTech family alone, plus a fourth for the 1.6. This is the family key the per-engine table above draws on.
| NGK plug | Stock number | Gap | Cylinders | Engine family |
|---|---|---|---|---|
| NGK LZKR6AI-10G | 97999 | 0.9 mm | 3 | 1.2 naturally aspirated, non-turbo — EB2F / EB2FAD (HMH, F12XEL) |
| NGK ILZKGR7B8G | 97434 | 0.8 mm | 3 | 1.2 turbo and hybrid, 2019 on — EB2ADT, EB2ADTD, EB2ADTS, EB2ADTX/XM, EB2LTD, EB2LTDH2, EB2LTEDH2. OE 9816317880 / 9833964280 / 9833253880 |
| NGK SIZKBR8B8HG | 91874 | 0.8 mm | 3 | 1.2 turbo pre-2019 — EB2DTS. OE 9829930180 |
| NGK — type designation not published | 91035 | 0.7 mm | 4 | 1.6 turbo and PHEV — EP6FADTXD, EP6FADTXHP, EP6FADTXHPD |
Diesels and Electric Variants
Every UK variant of the MG HS in this generation is petrol or petrol-hybrid, so every engine in the table takes spark plugs. There is no diesel or battery-electric variant to account for.
Recommended Spark Plugs
NGK ILNAR8B7G
Order by stock number
Buy a full set
How Often to Change Them
We are not publishing a mileage figure for this car, because we could not source one. No manufacturer service interval was found for any of the vehicles in this guide, and we will not print a number we cannot attribute.
The figures that circulate online mostly come from parts-catalogue “recommended intervals”, and those contradict each other on cars that share an engine — the same 1.0 T-GDi appears at 75,000 km on one model page and 30,000 km on another; the same Stellantis 1.2 turbo appears at 10,000 km on one and 30,000 km on another. Those are catalogue defaults, not manufacturer schedules, and quoting them as though they were would be dishonest.
The figure that governs your car is in the service schedule in the handbook, or in the manufacturer’s online service planner. As a practical matter, replace plugs sooner than the schedule if the engine misfires under load, idles roughly, is slow to start, or fuel consumption has crept up without another explanation.
Frequently Asked Questions
What spark plugs does an MG HS use?
The MG HS takes NGK ILNAR8B7G (NGK ILNAR8B7G (91970)), gapped at 0.7 mm, 4 needed.
How many spark plugs does an MG HS need?
4 — one per cylinder.
Do diesel MG HS models use spark plugs?
There is no diesel variant of this car in the range covered here, so the question does not arise. In general, though, diesels use glow plugs rather than spark plugs — glow plugs are heaters for cold starting, not igniters.
How often should spark plugs be changed on an MG HS?
Follow the service schedule in your handbook. We deliberately do not publish a mileage figure here: no manufacturer interval could be sourced for this car, and the figures that circulate come from parts-catalogue defaults that contradict each other across models sharing the same engine. Change plugs sooner than the schedule if the engine misfires under load, idles roughly or is slow to start.
Can I use a different brand of spark plug in an MG HS?
Yes, provided the replacement matches the original on thread size, reach, heat range, seat type and electrode material, and is gapped to the figure in the table. Cross-reference by the OE number rather than by the model name — that is the reference that identifies the part unambiguously. Do not fit a plug of a different heat range because it looks similar or shares part of the type code.
How we check fitment for this guide
We cross-reference fitment figures against manufacturer specifications and OE-supplier catalogue data where available, and matched to the standard codes that actually govern fit — battery type/group sizes, wiper lengths and fitting types, bulb fitment codes, tyre size markings, and oil specifications. We work by make, model, year, engine, and build date, because a single model can take different parts across its life. Where the right part depends on your exact vehicle, we tell you to confirm by registration or VIN. More on our method →