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How often should spark plugs be changed on a Lexus RX 350?

The recommended spark plug replacement interval for a Lexus RX 350 is typically every 60,000 to 100,000 miles, depending on driving conditions and the manufacturer's recommendations. Spark plugs play a crucial role in the engine's performance and fuel efficiency, so it's important to replace them at the appropriate intervals to ensure your Lexus RX 350 runs smoothly.


Understanding Spark Plug Replacement for the Lexus RX 350


Spark plugs are responsible for igniting the air-fuel mixture in the engine's cylinders, which is essential for the engine to run. Over time, the spark plugs can become worn or fouled, leading to misfiring, reduced fuel efficiency, and even engine damage if left unchecked.



  • The Lexus RX 350 typically requires spark plug replacement every 60,000 to 100,000 miles, depending on the driving conditions and the manufacturer's recommendations.

  • Factors that can affect the spark plug lifespan include the quality of the fuel, driving conditions (such as frequent towing or hauling), and the engine's overall condition.

  • It's important to use the correct spark plug type and gap specified by the manufacturer to ensure optimal engine performance.

  • Replacing the spark plugs at the recommended intervals can help improve fuel efficiency, reduce emissions, and prevent more costly engine repairs down the line.


By following the manufacturer's recommendations and replacing the spark plugs on your Lexus RX 350 at the appropriate intervals, you can help ensure your vehicle runs at its best and avoid potential issues caused by worn or faulty spark plugs.

When to replace spark plugs on Lexus RX 350?


EVERY 60,000 MILES
When you hit your 60,000-mile service appointment, you'll need to replace several parts. This includes spark plugs. Spark plugs help your engine start, providing the spark to begin the combustion process within the engine.



How do I know if my spark plugs need changing?


5 Signs You Need New Spark Plugs

  1. Engine Misfires. A misfiring engine is a big sign that one or more of your spark plugs are not firing properly.
  2. Poor Gas Mileage. When spark plugs are working correctly, they burn fuel efficiently in your engine.
  3. Trouble Starting.
  4. Slow Acceleration.
  5. Rough Idling.



How long do Lexus spark plugs last?


every 100,000 miles
General Guidelines for Spark Plug Replacement
Although the aforementioned signs are reliable indicators, adhering to a structured maintenance schedule can preempt many potential issues. Generally, for modern Lexus models equipped with iridium or titanium spark plugs, replacement is recommended every 100,000 miles.



What are the signs of a bad spark plug?


What are the signs your Spark Plugs are failing?

  • Engine has a rough idle. If your Spark Plugs are failing your engine will sound rough and jittery when running at idle.
  • Trouble starting. Car won't start and you're late for work… Flat battery?
  • Engine misfiring.
  • Engine surging.
  • High fuel consumption.
  • Lack of acceleration.



How do I know if spark plugs need replacing?


The most common signs of bad spark plugs include start-up trouble, rough idling, sluggish acceleration, declining fuel economy, engine misfiring, and engine knocking.



How many spark plugs are in a Lexus RX 350?


Over time, the plugs will provide less spark as wear progresses. This repair is made difficult by the three spark plugs that are on the back side of the engine.



Can spark plugs last 200 000 miles?


Older cars often had to have their spark plugs replaced every 5,000 to 10,000 miles, while some newer cars — with computer controls and more modern plugs — can go more than 100,000 miles on a set of plugs. As is often the case, the best source of service information for your vehicle is the owner's manual.



How much does it cost to replace spark plugs in a Lexus IS 350?


The average cost for a Lexus IS350 Spark Plug Replacement is between $305 and $356 but can vary from car to car.



How much does it cost to replace spark plugs in a Lexus RX350?


between $384 and $455
The average cost for a Lexus RX350 Spark Plug Replacement is between $384 and $455. Labor costs are estimated between $271 and $342 while parts are typically priced around $113. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.