How much is a transmission fluid change for a Lexus IS350?

In most cases, a transmission fluid change for a Lexus IS350 costs about $150–$350 at an independent shop, and roughly $250–$500 at a Lexus dealership. The exact price depends on the service type, your model year, and regional labor rates.

The IS350 uses an automatic transmission—six speeds on older generations and eight speeds on newer ones—that requires Dexron VI fluid. Costs vary based on whether you’re just draining and refilling or doing a full pan service with a new filter and gasket, as well as whether you visit a dealer or an independent shop. Fluids and labor together drive the total, and local market rates can shift these numbers somewhat.

Pricing by service type

Here is a practical breakdown of common service options and typical price ranges you’re likely to see in the United States. These figures reflect common practices as of recent years and can vary by region and shop.

• Drain and fill (no pan drop or filter change): Independent shops generally charge about $120–$200; dealerships may range from $180–$350.


• Full transmission service (pan drop, replace filter, new gasket, and fluid): Independent shops usually run about $230–$350; dealerships typically price around $350–$600.


• Transmission flush (machine-assisted fluid replacement): Often $200–$450, depending on the shop and whether a flush is recommended for your IS350.

Prices vary by generation (6-speed vs 8-speed), labor rates, and whether additional items (pan gasket, OEM fluids, or software adaptation) are needed. Always confirm the exact scope of the service and the fluid specification before you authorize work.

What to expect from the service

The steps and duration can differ depending on whether the shop performs a drain-and-fill or a full service with a filter. Here is a typical sequence you might encounter.

• Vehicle is lifted and the transmission is accessed; the old fluid is drained from the pan or the dedicated drain plug.


• If performing a pan drop service, the pan is removed, the old filter (if applicable) is replaced, and the pan gasket is refreshed.


• New Dexron VI fluid is added to the transmission to the manufacturer’s specified level; some shops will also road-test and recheck level after a short drive.


• Many technicians reset or adapt transmission learning as needed to ensure smooth shifting after fluid replacement.

Completion times typically range from about 30 minutes for a drain-and-fill at a small shop to 1–2 hours for a full pan service, depending on the vehicle and the shop’s workflow.

Fluid type and capacity tips

Use the manufacturer-approved Dexron VI specification for the Lexus IS350. Fluid capacity varies by generation: a standard drain-and-fill replaces an estimated 3–5 quarts, while a full pan service with filter replacement generally requires about 9–11 quarts of fluid. Fluids can cost roughly $7–$15 per quart, depending on brand and synthetic content. If you’re already due for a filter change, a full service often makes more sense than a simple drain-and-fill.

Summary

For a Lexus IS350, plan on roughly $150–$350 for a drain-and-fill at an independent shop and about $250–$500 at a dealership. A full transmission service with a filter and gasket typically runs $230–$350 at independents and $350–$600 at dealers, while a flush may sit in the $200–$450 range. Always confirm the service scope, fluid type (Dexron VI), and total fluid volume with your technician, and remember that prices vary by model year, location, and labor market. Regular, correctly specified transmission maintenance helps preserve shifting performance and longevity.

How often should Lexus transmission fluid be changed?

The Lexus transmission fluid change interval varies by model and fluid type, but generally ranges from 30,000 to 60,000 miles or every 3 to 5 years for most automatic transmissions. Some models with WS fluid have a longer interval (60,000 miles or 6 years), while others with T-IV fluid need changes every 30,000 miles or 3 years. It's crucial to consult your owner's manual for the specific recommendation for your vehicle and consider changing the fluid sooner under harsh driving conditions like towing or stop-and-go traffic. 
This video explains the difference between different types of Lexus transmission fluids and their recommended change intervals: 1mThe Car Care NutYouTube · Apr 8, 2023
General recommendations

• Standard interval: A common recommendation for many Lexus models is between 30,000 and 60,000 miles, or every 3 to 5 years. 
• Specific fluid types: Some models with T-IV fluid require changes every 30,000 miles or 3 years, while models with WS fluid can go up to 60,000 miles or 6 years. 
• Harsh driving conditions: If you frequently tow heavy loads, drive in stop-and-go traffic, or endure extreme heat, you may need to change the fluid more often, as this can accelerate fluid degradation. 

This video demonstrates the process of changing the transmission fluid and filter in a Lexus GS350: 1mDIY DanYouTube · Aug 4, 2018
How to determine the correct interval for your vehicle

• Check your owner's manual: This is the most important step, as it will provide the most accurate information for your specific make, model, and year. 
• Inspect the fluid: If you don't have your manual, you can get a clue from the fluid's condition. New fluid is typically red, while old or burnt fluid turns brown or black. If you see signs of discoloration, it's time for a change. 
• Consult a Lexus technician: If you're unsure, a Lexus dealership or a trusted mechanic can provide expert advice based on your vehicle's specific needs. 

This video explains how to check the transmission fluid level and what to do if the fluid is dirty: 27sProfessor's GarageYouTube · Apr 15, 2023

Is the Lexus IS 350 expensive to maintain?

The annual maintenance cost of a Lexus IS350 is $543. Repair and maintenance costs vary depending on age, mileage, location and shop.

How much is a transmission for a Lexus IS350?

Lexus IS 350 Transmission Cost
The cost of a new Lexus IS 350 transmission could be over $3,500 depending on the car, however, transmission services such as fluid changes and a transmission fluid flush are greatly less expensive, in some cases costing less than $150.

Is 100,000 miles too late to change transmission fluid?

No, it is not bad to change transmission fluid after 100,000 miles, and in most cases, it's recommended, especially if you've never done it before. The main risk is that old, dirty fluid can contain debris that might clog up passages if flushed aggressively, but this can be mitigated by opting for a "drain and fill" method instead of a full-system flush, which is safer for high-mileage transmissions. Always check your owner's manual for the specific recommendations for your vehicle. 
This video explains the potential risks and benefits of changing transmission fluid in a high-mileage vehicle: 58sChrisFixYouTube · Apr 8, 2016
Why it's a good idea to change the fluid

• Protects the transmission: Over time, transmission fluid degrades due to heat and usage, losing its ability to lubricate and cool the transmission. 
• Removes contaminants: The fluid circulates and picks up clutch material and other debris. Changing it removes these contaminants that can cause sludge buildup and clogs. 
• Prevents overheating: Clean fluid helps prevent the transmission from overheating, which can shorten its lifespan. 

How to change it safely

• Check the owner's manual: The manual is the most accurate source for your specific vehicle's recommended interval. 
• Choose "drain and fill": This method involves draining the old fluid and replacing it with new fluid, which is safer for high-mileage transmissions than a complete system flush. A full flush can dislodge a large amount of debris at once, which could be problematic. 
• Consult a professional: If you're unsure or if the fluid looks very dark, burnt, or contains metal flakes, it is best to have a qualified mechanic assess the transmission and perform the service. They can determine if a drain-and-fill is appropriate or if other services are needed. 

This video demonstrates how to perform a transmission fluid change: 59sScotty KilmerYouTube · Jun 8, 2021
When to be extra cautious

• If you have a history of neglect: If your car has never had its transmission fluid changed, the fluid is likely very dirty. A gradual drain and fill is the recommended approach to minimize risk. 
• If the transmission is already showing issues: If you are already experiencing shifting problems, trouble shifting gears, or strange noises, changing the fluid may not fix the problem and could even make it worse, so it's best to have a mechanic inspect it first.