Spark Plug Replacement Guide for the 2016-2024 Lexus IS300
Keep your IS300's engine running smoothly by choosing the right spark plugs for your specific engine.
- Confirm if your IS300 has the 2.0L Turbo 4-cylinder or 3.5L V6 engine before buying plugs.
- Stick to OEM-equivalent Iridium spark plugs from Denso or NGK for the best performance and longevity.
- Replace your spark plugs every 60,000 miles to avoid common issues like rough idle and poor fuel economy.
- While modern plugs are pre-gapped, it's a good practice to verify the gap before installation.
Understanding Your IS300's Engine is Key
Before buying spark plugs for your IS300, it's important to know which engine your car has. The "IS300" name was used on models with two different engines between 2016 and 2024. Using the wrong spark plugs can cause engine problems.
- 2016-2017 IS300 AWD: These models have a 3.5L V6 engine.
- 2018-2024 IS300 RWD: These models have a 2.0L 4-cylinder turbo engine.
- 2018-2024 IS300 AWD: These models have a different 3.5L V6 engine.
Pro Tip: Your owner's manual or a label under the hood will confirm your engine size (e.g., 2.0L or 3.5L). Always verify this before purchasing parts.
Choosing the Right Aftermarket Spark Plugs
For a modern, precise engine like the one in your Lexus, the brand and type of spark plug matter. While many brands are available, not all offer the same quality or longevity.
Tier 1: OEM-Equivalent Brands
Lexus uses Denso and NGK as original equipment (OEM) suppliers for their spark plugs. This means buying an Iridium spark plug from Denso or NGK is often the same as buying the part from a Lexus dealer, but usually at a lower cost. These brands are highly recommended by Lexus owners and mechanics for their reliability and performance. For the best results, stick with the Iridium type plugs these brands offer, as they are designed for long life and optimal engine performance.
🎬 Watch: Step-by-step guide to replacing your IS300 spark plugs and coils.Tier 2: Reputable Aftermarket Brands
Bosch is another well-known brand that produces high-quality Iridium spark plugs. They can be a good alternative if Denso or NGK are not available, but it's crucial to match the specific part number to your IS300's engine.
Tier 3: Economy Brands
Autolite and Champion offer more budget-friendly options. However, for a high-compression or turbocharged Lexus engine, using these plugs may lead to a shorter service life or potential performance issues like misfires. Most owners and mechanics strongly recommend sticking with the OEM brands (Denso or NGK) for best results.
Known Issues, Recalls, and TSBs
As of early 2026, there are no specific recalls or Technical Service Bulletins (TSBs) from the National Highway Traffic Safety Administration (NHTSA) directly concerning spark plugs for the 2016-2024 Lexus IS300. However, some earlier models had recalls for fuel pumps, which can cause engine stalling. While unrelated to spark plugs, it's always a good idea to check for any open recalls on your vehicle.
| Part | Cost Range (per plug) |
|---|---|
| New Aftermarket (Economy) | $4 - $10 |
| New Aftermarket (OEM-Equivalent) | $11 - $34 |
| New OEM (Dealer) | $15 - $42 |
Frequently Asked Questions (FAQ)
How often should I replace the spark plugs on my IS300?
The recommended replacement interval for the original Iridium spark plugs is typically every 60,000 miles. Some maintenance schedules suggest it could be as early as 40,000 miles. Sticking to this schedule helps prevent issues like misfires and poor fuel economy.
Do I need to gap the new spark plugs?
Most modern Iridium spark plugs from brands like Denso and NGK come pre-gapped for your specific vehicle. While they are usually correct out of the box, it is always a wise practice to gently check the gap with a feeler gauge to ensure it matches your engine's specification before installation. Do not use a coin-style gapper, as it can damage the fine Iridium tip.
🎬 Watch: How to safely gap Iridium spark plugs without damage.What is the difference between Iridium, Platinum, and Copper plugs?
Iridium is the material used in your car's original spark plugs and is the best choice for replacement. It has a very high melting point and is extremely durable, allowing for a very long service life. Platinum is also a long-life material but is generally considered a step down from Iridium. Copper plugs are the most basic type with the shortest life and are not recommended for modern Lexus engines.
Can I use a cheaper spark plug brand in my Lexus?
While you can, it is not recommended. Lexus engines are designed to work with high-quality Iridium spark plugs from Denso or NGK. Using cheaper plugs can lead to rough idling, misfires, poor fuel economy, and a much shorter replacement interval. The small amount of money saved on the parts is often not worth the potential problems.
Helpful Videos
Technical Specifications
OEM Part Numbers: 90919-01276 90919-01249 90919-01263
The 2016-2024 Lexus IS300 uses Iridium-type spark plugs. The specific part number and gap setting vary between the 2.0L Turbo (8AR-FTS) and 3.5L V6 (2GR-FKS) engines. For example, the 2.0L Turbo may use a plug with a 0.032" gap, while the V6 may use one with a 0.044" gap.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus IS300: