The Spark Plug Range at Tinkr
Every spark plug takes a jolt of high-voltage current and turns it into a spark that ignites the fuel-air mixture at exactly the right moment. Get the wrong plug for your engine and the gap, reach and heat range can all be slightly off, which is why fitment matters more than people expect for such a small part.
NGK Spark Plugs NZ
NGK spark plugs NZ drivers have relied on for decades are one of the most common original-equipment fitments across Japanese, Korean and European makes sold new here. Tinkr stocks the NGK range in copper, platinum and iridium, so it's a straightforward search by vehicle rather than a guess at a part number.
Bosch Spark Plugs NZ
Bosch spark plugs NZ-wide are the other major name Tinkr carries, with a similar spread from copper through to long-life iridium. Bosch spark plugs have a reputation for consistent gap tolerances straight out of the box, which matters on modern engines running tighter ignition timing than older designs needed.
Spark Plug Leads
On older vehicles without coil-on-plug ignition, spark plug leads carry the spark from the coil to each plug, and a cracked or perished lead can cause a misfire that looks identical to a failing plug. Tinkr stocks lead sets alongside the plugs, since it's worth ruling both out together.
Different Types of Spark Plugs Explained
There are several different types of spark plugs, and the difference comes down to the electrode tip metal. Copper plugs are cheapest and conduct well but wear fastest, platinum suits most everyday driving, and iridium goes further again, often past 60,000km thanks to a harder, finer electrode.
Do diesel engines have spark plugs at all? No, standard diesels don't, because diesel ignites under compression alone rather than from a spark. What diesels use instead are glow plugs, which is where the confusion comes from. The difference between glow plugs and spark plugs is timing and job: a glow plug preheats the chamber before a cold start, while a spark plug fires continuously to ignite the fuel-air mix on demand. They're not interchangeable.
How many spark plugs do cars have? It depends on cylinder count: most four-cylinder engines run four plugs, one per cylinder, six and eight-cylinder engines run six or eight, and a handful of performance engines use two per cylinder for a more complete burn. Cylinder count also affects size, since some smaller-displacement and turbocharged engines run a small spark plug with a shorter reach to suit a more compact chamber, so getting the exact size right matters as much as the type.
Find the Right Spark Plugs for Your Car
Looking to find spark plugs for my car without guessing at part numbers? Tinkr's rego checker does exactly that. Search your rego, or your vehicle's year, make and model, and it'll confirm the correct plug type, gap and quantity before you order. You'll also need a spark plug socket to get the old ones out, a deep, thin-walled socket sized to fit down the plug well without cracking the insulator, which Tinkr stocks alongside the plugs. If your vehicle isn't listed, contact us and our team will help track down the right part.
Spark Plug Maintenance: Cleaning, Checking & Testing
Knowing how to check spark plugs helps even before you're ready to replace them. Pull one and look at the tip: light tan or grey is normal, while heavy soot or oil fouling signals a problem. Learning how to clean spark plugs with a wire brush and contact cleaner can buy a fouled plug some extra life, though it's no substitute for replacement once a plug is past its service interval.
If your engine's running rough, how to test a spark plug is usually the first step: reconnect it to its lead or coil, ground the body against the block, and check for a strong blue spark when cranked. A weak or absent spark points to the plug, though it's worth knowing how to test spark plug coil separately too, since a failing coil causes the exact same symptoms and it's easy to replace the wrong part. Testing the coil first, before assuming the plug itself is at fault, can save buying a set you didn't need.
How long do spark plugs last? Copper is typically good for 20,000-30,000km, platinum stretches to around 60,000km, and iridium can run 100,000km or more, though your manufacturer's specific interval should always take priority over general figures.
Why Buy Spark Plugs from Tinkr
Buying from Tinkr means genuine NGK or Bosch stock matched to your exact vehicle, not a boxed part that's close enough. We carry 150,000+ parts, ship NZ-wide in 1 to 3 business days (same-day dispatch before 2pm), and back it with 0800 support from a real NZ team if the rego checker doesn't cover an unusual setup. Afterpay is available for a full set across six or eight cylinders, and Club Tinkr members pick up ongoing perks on repeat servicing orders. As for what the best spark plugs cost, spark plug price varies mainly by type rather than brand: how much spark plugs are for a basic copper set is a fraction of an iridium set, and exact pricing is always shown against your specific vehicle listing.
Spark plug types at a glance
- Copper: cheapest option, best conductivity, shortest life. Typical service interval: 20,000-30,000km.
- Platinum: longer-lasting than copper, suits most everyday driving. Typical service interval: around 60,000km.
- Iridium: finest electrode, longest life, often the OE choice on newer engines. Typical service interval: 100,000km+.
- Double platinum: platinum on both electrodes, common on older waste-spark ignition systems. Typical service interval: around 60,000km.
Frequently Asked Questions
How long do spark plugs last? Most spark plugs last anywhere from 20,000km to over 100,000km depending on the type, with copper at the shorter end and iridium at the longer end. Tinkr's rego checker will confirm the exact type and service interval your manufacturer specifies, rather than leaving you to guess from a general range.
How much are spark plugs? Spark plug price mainly depends on the type rather than the brand, with copper sets at the budget end and iridium sets costing more upfront but lasting several times longer. Exact pricing is always shown against your specific vehicle on Tinkr, so how much spark plugs cost for your car is never a guessing game.
How many spark plugs does a car have? Most cars have one spark plug per cylinder, so a four-cylinder engine runs four plugs and a six-cylinder runs six, though a handful of performance engines use two per cylinder. Search your vehicle on Tinkr and the correct quantity and spec for your engine will come up automatically.
Do diesel engines have spark plugs? No, standard diesel engines don't have spark plugs because diesel ignites under compression rather than from a spark. Diesels use glow plugs instead, which preheat the combustion chamber for a cold start, and Tinkr stocks both spark plugs and glow plugs depending on what your engine actually needs.
How do I find the right spark plugs for my car? Use Tinkr's rego checker: search your rego or your vehicle's year, make and model, and it'll confirm the correct spark plug type, gap and quantity before you order. If your vehicle isn't listed or you're still not sure, contact us and our team will help you find the right part.
What tool do I need to change spark plugs? You'll need a spark plug socket, a deep, thin-walled socket that fits down the plug well without damaging the ceramic insulator, along with an extension bar and a torque wrench to avoid over-tightening. Tinkr stocks spark plug sockets alongside the plugs themselves, so it's easy to grab both in one order.
