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davidford

Automatic Transmission Fluid Change Interval

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I looked at the manual on my IS 250 regarding routine maintenance. My recollection (on other cars I have owned) is that the automatic transmission fluid on a vehicle should be changed every 30,000 to 40,000 miles. I did not find a reference to that in the manual on the IS 250. Maybe I overlooked it. Nonetheless, what should the interval be for replacing the fluid?

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I looked at the manual on my IS 250 regarding routine maintenance. My recollection (on other cars I have owned) is that the automatic transmission fluid on a vehicle should be changed every 30,000 to 40,000 miles. I did not find a reference to that in the manual on the IS 250. Maybe I overlooked it. Nonetheless, what should the interval be for replacing the fluid?

I asked my dealer about this a while back. They stated that the fluid should last the lifetime of the car and will never need to be changed. I was like.....ok.

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Same question on my 2002 IS300. No mention of auto trans fluid interval in the manual. There's a sticker on the dipstick that says something like 'does not require changing under normal driving conditions' - but I now have 140K, and there's a lag shifting from 2nd to 3rd (I do stick to 'normal' driving). Should I change it anyway ? Thanks !

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2IS auto transmissions are sealed - you cannot drain the fluid. So that's why there is nothing in the maintenance handbook, and why Lexus consider it a lifetime fluid.

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The transmission on the RWD IS250 has a "overflow" plug on the bottom of the transmission pan. And a refill plug on the drivers side of the transmission housing. So it's not technically sealed. I was told a drain and fill would be only 1.48 quarts of fluid replaced out of the 7.92 quarts of the entire transmission. Thats only about 18.69% of fluid being replaced each time. Not alot compared to some other vehicles.

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I'm not touching it. Fluid will remain in car during my ownership period.

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I looked at the manual on my IS 250 regarding routine maintenance. My recollection (on other cars I have owned) is that the automatic transmission fluid on a vehicle should be changed every 30,000 to 40,000 miles. I did not find a reference to that in the manual on the IS 250. Maybe I overlooked it. Nonetheless, what should the interval be for replacing the fluid?

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To attempt to change the fluid risks doing harm on these vehicles, therefore no action required.

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