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Brand Overview
NGK is a Japanese manufacturer and the largest spark plug producers. OE supplier to most European and many Asian manufacturers. Their Laser Iridium and Laser Platinum ranges are industry benchmarks.
Denso is a Japanese automotive parts giant (Toyota Group). OE supplier primarily to Toyota, Honda, and Subaru. Their Iridium TT (Twin Tip) range features a unique dual-electrode design.
Comparison
| Feature | NGK | Denso |
|---|---|---|
| Range Width | Very wide (covers almost every car) | Wide (occasional gaps for European) |
| OE Applications | BMW, Mercedes, Ford, Hyundai, Kia, and some VW Group engines | Toyota, Honda, Subaru, Mazda |
| Iridium Quality | Excellent | Excellent |
| Platinum Quality | Excellent | Excellent |
| Unique Technology | Laser-welded centre electrode | Twin-tip (TT) design |
| Availability (UK) | Excellent — stocked everywhere | Good — most auto parts stores |
| Price | Slightly higher | Slightly lower |
Recommended Spark Plugs for NGK vs Denso
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Verdict
Both are outstanding manufacturers. The simple rule: if your car came with NGK plugs from the factory, use NGK. If it came with Denso, use Denso. If you’re unsure, NGK has the widest range and is the safe default choice for any car in the UK market.
Frequently Asked Questions
Is NGK better than Denso?
They’re extremely close in quality. NGK has a wider range and broader OE coverage in the UK. Denso excels on Japanese vehicles where they’re the factory supplier.
Can I switch from NGK to Denso?
Yes, as long as the plug specification matches exactly — same heat range, thread, reach, and gap. Cross-reference tools on both manufacturers’ websites help find equivalents.
Are Bosch spark plugs any good?
Yes. Bosch is a genuine third option and is OE on many VW Group and Vauxhall/Opel engines. Worth knowing that OE supply is engine- and plant-specific rather than brand-wide: some VW Group engines leave the factory with Bosch plugs and others with NGK, so check what came out of your engine rather than assuming by marque.
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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 →