What to do after putting in wrong transmission fluid - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jaits · 11-07-2022, 12:38 AM

I mistakenly put Motul 300 LS into my 2013 transmission today. Managed to catch the mistake right after I finished filling it and quickly drained it all out. The car now has no fluid in the trans and I haven't moved the car since. I later ordered Redline MT90 75W90 (regular Motul 300 was out of stock).

I was wondering if any possible damage/problem from the LS fluid can be done to the transmission through this quick fill and drain. and when I fill with the Redline later on, should I do a flush?

Any opinions and thoughts are appreciated. Thanks!

x808drifter · 11-07-2022, 04:47 AM

Trans flush if your super worried.
As for damage long term or other? IDK

Ultramaroon · 11-07-2022, 12:33 PM

I'd drive it on the first refill for a bit and do it once again for good measure. Likely just a waste of good oil but worth the peace of mind. Do it while the trans is still warm.

Jdmjunkie · 11-07-2022, 12:51 PM

When my shop did my transmission fluid they accidentally ordered all 300ls, so we called Motul and they said it wouldn't be an issue to run it.

humfrz · 11-26-2022, 06:54 PM

Quote:

Originally Posted by jaits

I mistakenly put Motul 300 LS into my 2013 transmission today. Managed to catch the mistake right after I finished filling it and quickly drained it all out. The car now has no fluid in the trans and I haven't moved the car since. I later ordered Redline MT90 75W90 (regular Motul 300 was out of stock).

I was wondering if any possible damage/problem from the LS fluid can be done to the transmission through this quick fill and drain. and when I fill with the Redline later on, should I do a flush?

Any opinions and thoughts are appreciated. Thanks!

Hello jaits, and welcome to our forum -

Don't worry about, just refill the transmission with the proper stuff and drive the car.

chipmunk · 11-28-2022, 07:44 AM

If you haven't driven much on the LS fluid, like Ultramaroon said, drive it *gently* for a bit on the new fluid, and then change again.

From my understanding, the LS fluid has higher ZDDP content. It's harsh on yellow metals only under pressure. They create a hard layer on top of the metal base when under pressure - it's harder than the base material itself that it pits the base metal during regular wear and tear. Once you replace the GL-5 with a GL-4, the concentration will be diluted enough to be considered safe *by me*, but to be on the safe side flush after a few miles of warmup and *gentle* driving.

jaits · 12-13-2022, 01:29 AM

Thank you for all the replies and help. Just a quick update since my last post. After I had gotten the new Redline oil, I drained the old Motul and flushed it with a quarter liter of Redline to get the residues out. I am sure that there is a better and safer method as mentioned by others but it was the best I can do given the circumstance. Currently been driving the car for over a month and the shifts are nice and smooth.

11-07-2022, 12:38 AM	#1
jaits Member Join Date: Nov 2022 Drives: 13' brz Location: Canada Posts: 11 Thanks: 0 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	What to do after putting in wrong transmission fluid I mistakenly put Motul 300 LS into my 2013 transmission today. Managed to catch the mistake right after I finished filling it and quickly drained it all out. The car now has no fluid in the trans and I haven't moved the car since. I later ordered Redline MT90 75W90 (regular Motul 300 was out of stock). I was wondering if any possible damage/problem from the LS fluid can be done to the transmission through this quick fill and drain. and when I fill with the Redline later on, should I do a flush? Any opinions and thoughts are appreciated. Thanks! Last edited by jaits; 11-07-2022 at 12:57 AM.

11-07-2022, 12:33 PM	#3
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,866 Thanks: 52,121 Thanked 36,516 Times in 18,918 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	I'd drive it on the first refill for a bit and do it once again for good measure. Likely just a waste of good oil but worth the peace of mind. Do it while the trans is still warm. __________________ service manuals

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11-07-2022, 04:47 AM	#2
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,646 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Trans flush if your super worried. As for damage long term or other? IDK

11-07-2022, 12:51 PM	#4
Jdmjunkie Senior Member Join Date: Apr 2017 Drives: Scion FR-S 10 Series Location: Las Vegas, Nev. Posts: 341 Thanks: 1,839 Thanked 204 Times in 128 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	When my shop did my transmission fluid they accidentally ordered all 300ls, so we called Motul and they said it wouldn't be an issue to run it.

11-28-2022, 07:44 AM	#6
chipmunk Senior Member Join Date: Mar 2017 Drives: _ Location: _ Posts: 440 Thanks: 50 Thanked 178 Times in 104 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	If you haven't driven much on the LS fluid, like Ultramaroon said, drive it *gently* for a bit on the new fluid, and then change again. From my understanding, the LS fluid has higher ZDDP content. It's harsh on yellow metals only under pressure. They create a hard layer on top of the metal base when under pressure - it's harder than the base material itself that it pits the base metal during regular wear and tear. Once you replace the GL-5 with a GL-4, the concentration will be diluted enough to be considered safe *by me, but to be on the safe side flush after a few miles of warmup and gentle* driving.

12-13-2022, 01:29 AM	#7
jaits Member Join Date: Nov 2022 Drives: 13' brz Location: Canada Posts: 11 Thanks: 0 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thank you for all the replies and help. Just a quick update since my last post. After I had gotten the new Redline oil, I drained the old Motul and flushed it with a quarter liter of Redline to get the residues out. I am sure that there is a better and safer method as mentioned by others but it was the best I can do given the circumstance. Currently been driving the car for over a month and the shifts are nice and smooth.

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