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Mechanical Maintenance (Oil, Fluids, Break-In, Servicing) Everything related to the mechanical maintenance of the FR-S and BRZ


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Old 11-07-2022, 01:38 AM   #1
jaits
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Question 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 01:57 AM.
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Old 11-07-2022, 05:47 AM   #2
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Trans flush if your super worried.
As for damage long term or other? IDK
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Old 11-07-2022, 01:33 PM   #3
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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.
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Old 11-07-2022, 01:51 PM   #4
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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.
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Old 11-26-2022, 07:54 PM   #5
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Quote:
Originally Posted by jaits View Post
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.

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Old 11-28-2022, 08:44 AM   #6
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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.
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Old 12-13-2022, 02:29 AM   #7
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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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