Does "lifetime" transmission fluid ever need changing?
Often, yes. Some manufacturers describe transmission fluid as "lifetime," but the fluid still breaks down with heat and miles, and many owner's manuals list a replacement interval under severe driving conditions such as frequent stop-and-go traffic, towing or hills. Other makers, like Honda, schedule it outright. Checking the fluid's condition and following the severe schedule when it applies is a good way to protect the transmission.
What fluid does in a transmission
Automatic transmission fluid lubricates, cools and transmits pressure to engage the clutches. Heat is its enemy; stop-and-go traffic, hills and towing all raise transmission temperature. Over time, the fluid's friction properties change and it collects wear material.
Signs your fluid needs attention
- Fluid that's dark brown or smells burnt (new fluid is usually red or amber, though some newer fluids are different colors)
- Harsh or delayed shifts
- Slipping, flaring revs between gears
- A transmission fluid leak
Our approach
We check your manufacturer's schedule, the fluid's condition and how you drive. If it's due or looks worn, we replace it with the exact fluid your transmission requires. If it still looks good, we'll tell you that too. A customer once came in for a transmission and differential service; the differential fluid turned out to be nearly new, so we skipped it.
On some cars, low transmission fluid even turns on the check engine light, and topping it up to the right level fixes it.
From drivers who came to us
I brought in my recently purchased, used 2013 highlander for a transmission service and rear differential fluid change… even let me know that my differential fluid was actually looking pretty new and wouldn't need servicing.
Transmission was acting up we did not think it would pass smog… it did pass smog and gets better Gas mileage now so happy we took it there
Excerpts from verified customer reviews on Yelp.
More questions
Can changing old transmission fluid cause problems?
On a high-mileage transmission that has never been serviced and is already slipping, a fluid change won't fix it and occasionally coincides with failure. On a healthy transmission, fresh fluid on schedule is protective.
Flush or drain and fill?
Most manufacturers specify a drain and fill, sometimes repeated, using the exact fluid type. We follow the manufacturer's procedure for your transmission.
Does a CVT need fluid changes?
Most CVT manufacturers do specify fluid replacement intervals, and CVTs are sensitive to using the correct fluid.