What is the best oil for Lexus gs400?
For the Lexus GS400, the best choice is a high-quality full-synthetic engine oil, typically SAE 5W-30, with 5W-40 as a solid alternative in hot climates or under heavier driving. This article explains why, the exact specs to look for, and how to maintain your 1UZ-FE engine to keep it running smoothly.
Understanding the GS400's oil needs
The GS400 uses the 1UZ-FE V8, a robust engine that benefits from a top-tier synthetic oil to reduce wear and maintain consistent lubrication across temperatures. Most model-years of the GS400 align with a recommended viscosity of 5W-30 for everyday driving, while 5W-40 can provide additional protection in hotter climates or under heavy load. The engine’s oil capacity is roughly 5.5 quarts (with a filter), so plan on buying a little extra for the first fill. Always confirm the exact specification in your owner's manual, as regional rules or year-specific updates can adjust the recommended grade.
Recommended viscosity and specifications
What follows are the commonly recommended viscosity options that align with the GS400’s 1UZ-FE engine and typical climate conditions. Use the owner's manual to confirm the exact grade for your year and region.
- 5W-30 full synthetic with API SN/ILSAC GF-5 or newer; Lexus-approved or Toyota-approved synthetic oils are ideal for reliability.
- 5W-40 full synthetic for hot climates or heavy driving where extra high-temperature stability is beneficial.
- 0W-30 or 0W-40 can be acceptable only if your manual specifies them for extremely cold climates or certain markets; otherwise they are not the typical default for the GS400.
In practice, most GS400 owners default to 5W-30 full synthetic, using 5W-40 as a back-up in very hot environments or when the car is subjected to sustained high-load driving. Always follow the manual’s guidance and avoid mixing oils of different viscosities beyond what the manufacturer approves.
Brand and product choices
Choose high-quality, name-brand synthetic oils that meet or exceed API SN (or newer) and ILSAC GF-5 (or GF-6) specifications. Lexus-approved or Toyota-approved synthetic oils are reliable choices, and popular premium brands such as Mobil 1, Castrol EDGE, Royal Purple, Amsoil, and Valvoline SynPower all offer 5W-30 and 5W-40 formulations that are suitable for the GS400’s 1UZ-FE engine. When selecting oil, prioritize proven stability, good detergent chemistry, and compatibility with your climate and driving style.
Maintenance tips and practical notes
Oil change intervals for a GS400 running synthetic oil typically fall in the 5,000–7,500 mile range under normal driving conditions. In hot climates, with frequent short trips, or in severe service, you may prefer 3,000–5,000 miles to stay ahead of oil breakdown. Always check the dipstick and refer to the owner’s manual for exact intervals. Use a quality oil filter and ensure the drain plug and gasket are properly torqued during a change. If you notice unusual oil consumption or leaks, address them promptly to protect the engine’s longevity.
Summary
For the Lexus GS400, a high-quality full-synthetic oil is the best choice. Default to 5W-30 for most climates, with 5W-40 as a safe alternative in hot environments or under heavy load. Always verify the exact specification in your owner’s manual, choose oils that meet API SN or newer and ILSAC GF-5/ GF-6 standards, and favor Lexus-approved or Toyota-approved products when possible. Maintain regular oil changes (roughly 5,000–7,500 miles under normal use) and monitor oil levels and condition to keep the 1UZ-FE engine performing at its best.
What brand of oil does Lexus recommend?
Lexus recommends its own Lexus Genuine Motor Oil, which is a full-synthetic SAE 0W-20 for most new vehicles, or Toyota Genuine Motor Oil since Lexus is owned by Toyota. If you're looking for a third-party brand, top-performing brands like Mobil and Castrol are also recommended, but always consult your vehicle's owner's manual for the specific viscosity and specifications required for your model.
Recommended oils
- Lexus Genuine Motor Oil: This is the oil Lexus specifically recommends.
- Toyota Genuine Motor Oil: Since Lexus is the luxury brand of Toyota, the Toyota-branded oils are also highly recommended and meet Lexus specifications.
- SAE 0W-20: The recommendation for most new Lexus models.
- SAE 5W-30: May be recommended for older Lexus models.
- Third-party synthetic oils: If you prefer another brand, choose high-quality, high-performance synthetic oils from reputable brands.
- Examples: Mobil and Castrol are mentioned as good alternatives.
- Important: Always ensure the third-party oil meets the specifications in your owner's manual.
What to remember
- Always check your owner's manual: This is the most reliable source for the correct oil for your specific vehicle, especially for older models.
- Prioritize synthetic oil: Many Lexus dealerships recommend full-synthetic oil for its longer lifespan.
What oil does a GS400 take?
SAE 5W-30
5W-30 (All TEMPS) - SAE 5W-30 is preferred.
What kind of oil does a Lexus GS 450h take?
Mobil 1 – Advanced 0W-20 Fuel Economy Motor Oil, 5 Quart (Part No. 44967)
What oil is recommended for a Lexus GX 460?
Mobil 1 – Advanced 0W-20 Full Synthetic Motor Oil, Improves Fuel Economy, 5 Quart (Part No. 44967)
