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What kind of oil does a Lexus RX300 take?

The RX300 typically requires 5W-30 engine oil, which can be conventional, synthetic blend, or full synthetic, as long as it meets the vehicle’s specifications. Always check your specific model year in the owner's manual for exact guidance.


Launched in the late 1990s and produced through the early 2000s, the Lexus RX300 uses a 3.0-liter V6 engine. For most RX300s, the recommended viscosity is 5W-30, and the oil should meet a modern API service standard. Climate, driving habits, and model year can affect the precise recommendation, so it’s wise to confirm with the manual or a Lexus technician if you’re unsure.


Recommended oil grade and specs


The following guidelines outline the standard oil requirements you’re likely to see for the RX300. Be sure to verify them against your year and region.



  • Viscosity: 5W-30 is the standard grade for most RX300 models, providing protection across a broad range of temperatures.

  • API and certification: Use engine oil that meets API service SM or higher standards (for gasoline engines). Modern oils that meet SN or newer will also work as long as the viscosity is 5W-30.

  • Oil type: Conventional, synthetic blend, or full synthetic motor oil are all acceptable choices if they meet the specified viscosity and API standard.

  • Change interval: Follow the owner’s manual, but typical intervals range from about every 5,000 miles (8,000 km) with conventional oil to 7,500–10,000 miles (12,000–16,000 km) with synthetic oil, depending on driving conditions.

  • Oil filter: Replace the oil filter with every oil change to ensure contaminants are removed and oil flow remains optimal.


In practice, confirm the exact recommendation for your model year, since some early RX300 versions may list older API specifications. When in doubt, consult the owner’s manual or ask a Lexus technician.


Climate and driving considerations


Climate and driving patterns can influence oil choice and maintenance frequency. Hot climates or heavy highway driving may justify monitoring oil consumption more closely, while extremely cold environments can also impact viscosity needs. For a typical RX300, 5W-30 remains the standard unless your manual specifies an alternative for your conditions.


Practical tips for maintenance


Keep a regular maintenance schedule, use a high-quality oil filter, and reset maintenance reminders to ensure the engine stays protected and performs well over time.


What to verify for your year


Because the RX300 spanned several model years, there can be small differences in recommended standards. Always verify the exact specification for your year in the manual or with a Lexus service advisor to ensure compatibility with your engine and climate.


Summary


The Lexus RX300 commonly uses 5W-30 engine oil (conventional, synthetic blend, or full synthetic) that meets API service SM or higher. Verify the exact specification for your model year in the owner’s manual, and adjust the oil choice and change intervals based on climate and driving conditions. Regular oil and filter changes help maintain engine performance and longevity.

What kind of oil does a 3.7 L V6 take?


Capacities and Specifications - 3.7L

NameSpecification
Recommended motor oil (U.S.): Motorcraft® SAE 5W-20 Premium Synthetic Blend Motor Oil XO-5W20-QSPWSS-M2C945-A
Recommended motor oil (Canada): Motorcraft® SAE 5W-20 Super Premium Motor Oil CXO-5W20-LSP12WSS-M2C945-A



What kind of oil does a Lexus RX 300 take?


5W30
Genuine Lexus RX300 Engine Oil 5W30 Fuel Economy Semi Synthetic 08880-80845-BB.



What type of oil for 1999 Lexus RX300?


The correct oil for a 1999 Lexus RX300 is SAE 5W-30 motor oil, with a capacity of approximately 5 quarts when changing the filter. You can use either conventional or synthetic oil, but synthetic can offer better protection and performance. Always double-check the oil level after refilling and make sure the oil cap is securely on.
 
Key details for a 1999 Lexus RX300 oil change:

  • Oil type: SAE 5W-30 motor oil 
  • Capacity: Approximately 5 quarts (4.7 liters) including a filter change 
  • Optional: Synthetic oil is a recommended option that provides excellent protection, especially in different temperatures 



What kind of oil does a 2003 Lexus RX300 take?


The 2003 Lexus RX300 requires SAE 5W-30 motor oil, with a capacity of about 5 quarts when the filter is replaced. It is important to use a 5W-30 viscosity oil that meets the required specifications, such as those from brands like AMSOIL, Valvoline, Mobil 1, or genuine Lexus oil, and check the final level after refilling.
 
Oil type and capacity

  • Viscosity: SAE 5W-30
  • Capacity: Approximately 5 quarts (5.7 quarts is sometimes cited with filter change)
  • Note: Always check the dipstick after refilling to ensure the correct level. 

Oil grade and specifications
  • Grade: SL (API) 
  • Modern oils: Many modern oils meeting API SP or ILSAC GF-6 standards are suitable, as they provide excellent protection for both older and modern engines. 

What you need
  • SAE 5W-30 motor oil
  • Oil filter (a genuine Lexus filter is often recommended)
  • Oil change kit (often includes the filter and 5 quarts of oil) 


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.