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Lexus GS350 ATF Service Advice #5428550 05/13/20 07:42 PM
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JeffKeryk Offline OP
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Our GS350 F Sport is nearing 70K; I have been putting off servicing the transmission.
You probably know that a drain only removes about 2.5 quarts; the transmission holds 10 or more I believe...

My plan is to:
Lift and level the car

Drain and measure the fluid
Replace the same plus a little
Run the engine for perhaps 15 to 30 seconds
Repeat the spill and fill process perhaps 3 times

Run engine up to 105* (or whatever spec is)
Open plug to allow straw to set level.

My goal is to drain the pan of new fluid but avoid mixing with old as much as possible.
Question: How long would it take for the transmission pump to empty the pan?
I am guessing 15 to 30 seconds.
Does 3 iterations sound about right?


Of course I will check fluid color each time.
Thanks in advance for your thoughts.

If I change the filter, I will use a factory part.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428582 05/13/20 08:30 PM
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I would suggest going to the Lexus forms and look for a COMPLETE write up for the proper way. I did it with my wife's Rav4 with Redline D6 and added 1.5 Qts of Redline Racing and Low Vis Racing to better natch the viscosity of the D6 and to kill some of the slip agents in the Redline D6. I like a clean shifting trans with some slip, but butter smooth I don't like. 114 deg was the Rav4 #. I installed a 8ft hose from the trans pump exit to the pan and brought it under the drives door. I dumped the pan and added 4 Qts. It pumped into a bucket right there floor by the door by the ignition switch so the minute I saw that the trans pump was sucking air, I killed the car and refilled the pan. I repeated 4 times and used 14 Qt to flush out the garbage WS out for good. it was all burnt at 22,000 miles. I got sick being around the WS it smelled so bad. I had to open the doors in winter and wear a respirator to finish.

You wont have this problem, but I did in Minnesota and others in Canada have had the issue on brand new Rav4 that the trans was slipping with a factory fill because when it is 20 below the fluid constricts to being too low and sucks air. Lucky I was in the car at a 20 below night, I noticed a slip when we left a family party and I told the wife to pull over and idle for 5-8 minutes at 1,500 rpm to warm up and expand the ATF. We made it home fine with no slip and I added another Qt of D6 and I never had an issue again.


2018 Lowered Hyundai Kona AWD 1.6T
2014 Toyota Rav4 AWD
2005 Honda Civic
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428583 05/13/20 08:30 PM
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Ram02 Offline
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Are you going to use Maxlife Full Synthetic ATF???


2013 Malibu 2LT M1 5w30
2013 Accord Sport M1 AP 0w20
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428584 05/13/20 08:30 PM
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For something like this I would consider paying for a BG products flush. This way the fluid gets exchanged and you don't have to mess with it.

On my Wife's Scion, I just do a drain plug drop and get a few quarts, that is enough every two years for me.


'16 Ford Escape
'11 Scion XB
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428603 05/13/20 08:49 PM
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JeffKeryk Offline OP
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I follow the Lexus GS forum and I know the "proper way". Many say the WS is lifetime fluid. Fooey on that. Or the method I described with only 1 iteration.

I will use the Idemitsu WS equivalent. Full synthetic and great stuff, IMO.

I am not interested in a flush. But thanks for the suggestion.

I am asking to thoughts on my process: how many iterations and how long to move the fluid out of the pan?

Again, thanks to all.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428689 05/13/20 11:29 PM
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I do full transmission flush with AISIN AFW+ synthetic WS compatible oil every 30000 on my FJ Cruiser. I have a Magnefine filter in line with my external Hayden 679 cooler and every flush the oil comes out dark red and my shift quality remains as good as new.

Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428762 05/14/20 06:50 AM
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Gebo Online Content
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I’m tracking with you. Great questions. Are you gonna shift from D to N to R to P as well?

I’d do at least 3 drains. Since you’ve decided to replace with a different ATF, I’d feel better going 4. You may waste a little money but you would get a higher percentage of new ATF.

Are you gonna use a temp scanning tool or the elaborate “no tool” method to check ATF temp?

Have fun getting that black plastic cover with the two 10mm bolts back in place. Grrrrrr.....

I have no idea about your timing question.

Last edited by Gebo; 05/14/20 06:51 AM.

'98 LEX LS400 310K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 75K

Shell Gas and Truck 5w-30
Amsoil OE 10w-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Lexus GS350 ATF Service Advice [Re: JustinH] #5428849 05/14/20 08:29 AM
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Originally Posted by JustinH
For something like this I would consider paying for a BG products flush. This way the fluid gets exchanged and you don't have to mess with it.

I'm totally for this procedure!!

Re: Lexus GS350 ATF Service Advice [Re: Gebo] #5428859 05/14/20 08:39 AM
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Hmm, I had no issues with WS in my Highlander on original fluid with 145K...did a drain and fill because I don't believe in "lifetime" fluid either but still, performance was good.

Regardless, when I've done multiple drain and fills I've driven for a few minutes in between up to speed...locking up the TC to "mix" the fluid as much as possible before the next drain. Perhaps you can do this on the jack stands in between fills...bring it up to 50mph or so. Getting that little fluid out every time 4 might be the magic number for you.


2014 Acura MDX Tech SH-AWD
2014 Nissan Maxima SV Sport & Tech
2007 Honda Shadow Spirit VT1100C
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428880 05/14/20 08:54 AM
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JeffKeryk,

I eventually plan to change the ATF in my GS350 as well, but I have a few years before I reach enough miles. My question for you is on the first item in your list: How do you plan to safely "Lift and level the car"? This is the one thing stopping me from doing the procedure - I do not have access to a lift. All the other vehicles I have changed the ATF on are either 4x4 pickups with enough clearance to crawl under the vehicle, or front wheel drive cars where it is easier to access the transmission.

So, do you have access to a hydraulic lift? How will you lift and level the car?

Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428895 05/14/20 09:03 AM
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Ram02 Offline
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I would use Amsoil SS fluid and be done with it for the life of the ownership the fluid is that good


2013 Malibu 2LT M1 5w30
2013 Accord Sport M1 AP 0w20
Re: Lexus GS350 ATF Service Advice [Re: btanchors] #5428907 05/14/20 09:16 AM
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JeffKeryk Offline OP
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Originally Posted by btanchors
JeffKeryk,

I eventually plan to change the ATF in my GS350 as well, but I have a few years before I reach enough miles. My question for you is on the first item in your list: How do you plan to safely "Lift and level the car"? This is the one thing stopping me from doing the procedure - I do not have access to a lift. All the other vehicles I have changed the ATF on are either 4x4 pickups with enough clearance to crawl under the vehicle, or front wheel drive cars where it is easier to access the transmission.

So, do you have access to a hydraulic lift? How will you lift and level the car?


I have numerous trolley jacks, HF ramps and jackstands.
There is nothing special about the GS; I will simply position the jacks on the frame.
Leveling the car is easy; jackstands in front and floor jacks in back as level height adjusters.

By the way, I would consider doing a trans service early. There is good thought, in my opinion, that the 1st service is the most important because it removes break in materials.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Lexus GS350 ATF Service Advice [Re: JeffKeryk] #5428914 05/14/20 09:21 AM
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If I may add, I put a level on the roof of my car before doing any jacking. That way I know level. Then I do what Jeff says. Jack stands on front at the height I want them and then go to diff and jack there until the level on the roof shows level.

Yeah, I know I have issues.


'98 LEX LS400 310K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 75K

Shell Gas and Truck 5w-30
Amsoil OE 10w-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Lexus GS350 ATF Service Advice [Re: tbm5690] #5428916 05/14/20 09:22 AM
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JeffKeryk Offline OP
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Originally Posted by tbm5690
Hmm, I had no issues with WS in my Highlander on original fluid with 145K...did a drain and fill because I don't believe in "lifetime" fluid either but still, performance was good.

Regardless, when I've done multiple drain and fills I've driven for a few minutes in between up to speed...locking up the TC to "mix" the fluid as much as possible before the next drain. Perhaps you can do this on the jack stands in between fills...bring it up to 50mph or so. Getting that little fluid out every time 4 might be the magic number for you.

I see your point, but I am suggesting something different.
I do not want to mix the fluid. I want to use the transmission to move the new fluid out of the pan replacing it with the old fluid.
Then repeat the spill and fill procedure.

The goal is to drain old fluid and put in fresh.
Hence my question on how long to run the engine to move the new fluid out of the pan with a minimum of mixing old and new.


2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
Re: Lexus GS350 ATF Service Advice [Re: Gebo] #5428919 05/14/20 09:23 AM
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JeffKeryk Offline OP
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Originally Posted by Gebo
If I may add, I put a level on the roof of my car before doing any jacking. That way I know level. Then I do what Jeff says. Jack stands on front at the height I want them and then go to diff and jack there until the level on the roof shows level.

Yeah, I know I have issues.

Level against the frame might be better than the roof?

Last edited by JeffKeryk; 05/14/20 09:23 AM.

2018 Tesla Model 3, Medium Range Battery
2018 Lexus RX450h
2013 Lexus GS350 F Sport
2006 Acura TSX
2001 Tundra Access Cab, 1998 Accord LX, 1968 Corvette L36 Roadster, 1965 Olds 4-4-2
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