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Spark Plugs for Lexus LS400

Upgrade the ignition efficiency of your Lexus LS400 with spark plugs engineered for luxury performance. Premium solutions from NGK deliver dependable starts, and DENSO ensures smooth power output for a refined ride. Keep your LS400 driving seamlessly with advanced ignition components.

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  1. NGK Iridium IX
    8 pc NGK Iridium IX Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $70.99 Regular Price $100.99
    NGK / NTK
  2. NGK V-Power
    8 pc NGK V-Power Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Rating:
    100%
    1  Review
    Special Price $34.57 Regular Price $48.99
    NGK / NTK
  3. NGK Laser Iridium
    8 pc NGK Laser Iridium Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $77.90 Regular Price $110.99
    NGK / NTK
  4. DENSO Spark Plug
    8 pc DENSO Iridium TT Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Rating:
    100%
    1  Review
    Special Price $79.70 Regular Price $113.99
    DENSO
  5. NGK G-Power
    8 pc NGK G-Power Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $42.92 Regular Price $60.99
    NGK / NTK
  6. Fel-Pro Spark Plug Tube Seal Set
    Fel-Pro Valve Cover Spark Plug Tube Seal Set for 1990-1997 Lexus LS400 4.0L V8
    Special Price $29.15 Regular Price $41.99
    Fel-Pro
  7. DENSO Spark Plug
    8 pc DENSO Standard U-Groove Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $30.26 Regular Price $42.99
    DENSO
  8. Autolite Platinum Spark Plug
    8 pc Autolite Platinum Spark Plug for 1990-2000 Lexus LS400
    Special Price $37.42 Regular Price $52.99
    Autolite
    Out of stock
  9. E3 Spark Plug
    8 pc E3 Spark Plugs for 1995-1996 Lexus LS400 4.0L V8
    Special Price $58.24 Regular Price $82.99
    E3 Spark Plugs
  10. E3 Spark Plug
    8 pc E3 Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $58.24 Regular Price $82.99
    E3 Spark Plugs
  11. DENSO Spark Plug
    8 pc DENSO Iridium Power Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $72.79 Regular Price $103.99
    DENSO
  12. Fel-Pro Spark Plug Tube Seal Set
    Fel-Pro Valve Cover Spark Plug Tube Seal Set for 1998-2000 Lexus LS400 4.0L V8
    Special Price $26.84 Regular Price $37.99
    Fel-Pro
  13. Champion Spark Plug
    8 pc Champion Copper Plus Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $29.52 Regular Price $41.99
    Champion
  14. DENSO Spark Plug
    8 pc DENSO Standard U-Groove Spark Plugs for 1995-1996 Lexus LS400 4.0L V8
    Special Price $30.26 Regular Price $42.99
    DENSO
  15. Autolite Copper Core Spark Plug
    8 pc Autolite Copper Core Spark Plugs for 1990-2000 Lexus LS400
    Special Price $30.69 Regular Price $43.99
    Autolite
    Out of stock
  16. NGK Standard
    8 pc NGK Standard Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $30.93 Regular Price $43.99
    NGK / NTK
  17. Champion Spark Plug
    8 pc Champion Platinum Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $45.32 Regular Price $64.99
    Champion
  18. Bosch Spark Plug
    8 pc Bosch Platinum Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $46.02 Regular Price $65.99
    Bosch
  19. DENSO Spark Plug
    8 pc DENSO Platinum TT Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $47.32 Regular Price $67.99
    DENSO
  20. Autolite Double Platinum Spark Plug
    8 pc Autolite Double Platinum Spark Plug for 1990-2000 Lexus LS400
    Special Price $58.79 Regular Price $83.99
    Autolite
    Out of stock
  21. Bosch Spark Plug
    8 pc Bosch Double Platinum Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $63.31 Regular Price $89.99
    Bosch
  22. Autolite Iridium XP Spark Plug
    8 pc Autolite Iridium XP Spark Plug for 1990-2000 Lexus LS400
    Special Price $66.41 Regular Price $94.99
    Autolite
    Out of stock
  23. Champion Spark Plug
    8 pc Champion Double Platinum Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $68.57 Regular Price $97.99
    Champion
  24. NGK Laser Platinum
    8 pc NGK Laser Platinum Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $68.68 Regular Price $97.99
    NGK / NTK
  25. DENSO Spark Plug
    8 pc DENSO Double Platinum Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $69.33 Regular Price $98.99
    DENSO
  26. DENSO Spark Plug
    8 pc DENSO Double Platinum Spark Plugs for 1995-1996 Lexus LS400 4.0L V8
    Special Price $70.75 Regular Price $100.99
    DENSO
  27. Bosch Spark Plug
    8 pc Bosch Double Iridium Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $74.83 Regular Price $106.99
    Bosch
  28. DENSO Spark Plug
    8 pc DENSO Iridium Long Life Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $82.51 Regular Price $117.99
    DENSO
  29. Champion Spark Plug
    8 pc Champion Iridium Spark Plugs for 1990-2000 Lexus LS400 4.0L V8
    Special Price $85.02 Regular Price $120.99
    Champion
  30. NGK Spark Plug
    8 pc NGK Ruthenium HX Spark Plugs for 1997-2000 Lexus LS400 4.0L V8
    Special Price $97.73 Regular Price $139.99
    NGK / NTK
  31. DENSO Spark Plug
    8 pc DENSO Iridium Long Life Spark Plugs for 1995-1996 Lexus LS400 4.0L V8
    Special Price $106.67 Regular Price $151.99
    DENSO
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The Sixity Auto Advantage

Finding the right car spark plugs can seem complicated, but our goal is to make it simple. We combine a massive selection of parts from trusted brands with the expert, US-based support you need to make the right choice. With fast shipping and a 100% fitment guarantee, we provide a hassle-free shopping experience that has earned the trust of over a million customers.

Platinum, Iridium, and More

Choosing the right material is key to your engine’s performance and longevity. We carry a massive selection of aftermarket spark plugs in every type, from long-lasting iridium to dependable copper plugs for classic vehicles. Whatever your engine needs, we have the right plug to match its specific requirements, ensuring optimal spark and efficiency.

Expert Support When You Need It

Not sure which plug is right for your vehicle? Our friendly, US-based customer support team is here to help. With deep knowledge of our full catalog, they can guide you to the perfect car spark plugs for your specific make and model. We are committed to helping you buy with confidence and getting your installation done right the first time.

Frequently Asked Questions

Got a question about our automotive spark plugs? Here are a few things people often ask. For anything else, our main FAQ page has you covered.

How do I find the right spark plugs for my car?

Your best bet is our vehicle selector tool. Just plug in your car’s info, and we’ll show you exactly which plugs are guaranteed to work.

Are your aftermarket spark plugs as good as the originals?

Definitely. We only carry parts that are as good or better than the ones that came in your car, but without those dealership prices.

How often should I replace car spark plugs?

That really depends on the type. A standard copper plug is usually good for about 20,000 miles, while a high-end iridium one can last 100,000. Your owner’s manual will have the exact schedule for your engine.

Spark Plug Features

  • Precision ceramic insulators
  • Corrosion-resistant shell with triple high pressure gas seals
  • Screw or snap-on electrical connectors
  • Pre-installed metal compression gaskets
  • Copper-core electrode cooling
  • Application specific heat-range design
  • Improved cold-starting performance
  • Smooth firing at high or low engine RPM
  • Reduced electrode erosion and long service life
  • Enhanced ignition efficiency and fuel economy
  • Superior anti-fouling characteristics
  • Reduced hot-spark firing voltage requirements
  • Maximum engine horsepower and torque
  • Superior throttle-response, acceleration and WOT performance
  • Precision Laser-welded Iridium electrodes - 6X harder than platinum
  • Precision ceramic insulators
  • Corrosion-resistant shell with triple high pressure gas seals
  • Screw or snap-on electrical connectors
  • Pre-installed metal compression gaskets
  • Copper-core electrode cooling
  • Application specific heat-range design
  • Improved cold-starting performance
  • Smooth firing at high or low engine RPM
  • Reduced electrode erosion and long service life
  • Enhanced ignition efficiency and fuel economy
  • Superior anti-fouling characteristics
  • Reduced hot-spark firing voltage requirements
  • Maximum engine horsepower and torque
  • Superior throttle-response, acceleration and WOT performance
  • Precision Laser-welded Iridium electrodes - 6X harder than platinum
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