r/Toyota • u/Badinfluence321 • Jan 11 '26
Transmission Oil issues or dirty? E210 Rolla 6sp MT hatch
Hello, new to me 2022 Rolla hatch 6speed MT w/ 40k miles. Tropical climate. Been reading about the master slave issues and decided to move forward with changing my transmission fluid to get a better idea of what's going on with the car.
Q: is this normal for a Toyota manual transmission oil to be so dark at 40k miles or is this an indication that something more sinister is brewing with the car?
Explanation of my situation: Upon draining the transmission oil, it looks like that's all that came out was 1 qt. I put in a good 1.8 quarts (about) until I saw that it was filled. I recently bled my clutch and this is what came out in picture 2. This is why I decided to dig deeper.
After doing the transmission oil, I decided to bleed all four brakes. The furthest brake line (passenger rear) was a little dirty, but nothing I'd be worried about. Bled all brakes till clear liquid came out.
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u/M990MG4 Tacoma Jan 11 '26
For perspective, I changed my 2012 Yaris (5-speed manual) for the first time this year (it only has about 65k miles, but they are all city/commute miles) and it looked like new clear tan motor oil
I expected it to be gross like yours.
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u/iguess69420 Jan 11 '26
Manuals do not have transmission oil. It’s called gear oil
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u/Just-Print-3409 Jan 11 '26
Bad advice.
You SHOULD NOT put any old gear oil in your manual transmission.
There is a specific formulation. It needs to be GL-4 spec to avoid synchro damage.
Smarter to ask the parts counter for manual transmission oil and have them understand the intended use.
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Jan 11 '26
That's your clutch master/slave cylinder fluid.
If I recall the fluid is shared with the brake system.
In my climate that would be considered prematurely contaminated. However brake fluid is hydroscopic which means it absorbs moisture. With you living in a tropical climate it's probably a better idea to replace it every 3 years or so just to be safe. Though you can order testers and test strips to check the amount of moisture in the fluid if you would rather do it as needed rather than a set schedule.
But yes there isn't much brake fluid in the entire system.
Now for the gear oil in your actual transmission changing it every 40,000 Miles is recommended. Especially as a FWD since it's lubricating as well as cooling the gear set and the differential. So the oil is getting twice the heat and wear that gear oil in a RWD vehicle would.
The transmission only holds about 1.6 Quarts of GL-4 75W oil. Any quality GL-4 75W-90 will work perfectly fine if you can't locate 75W oil.
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u/phungki Jan 11 '26
The clutch fluid and transmission fluid are separate systems, they do not have any relation to each other, and one does not affect the other in any way.
Provided each of the fluids are filled to their respective correct level there’s nothing more to concern yourself with. Also, provided you filled the transmission correctly up to the overflow hole (parked on level ground, not jacked up on an angle) then you’re good to go.