Is Gear noise normal after oil change? | Corolla Altis 1.8

[syedhaadofficial]

People usually don't change their Manual gear oil but after reading this forum, every other person recommended to change it ASAP.

Hence, I went for it and today I bought 3 cans of (1 liter) genuine Toyota GL4 75w 90 oil for manual transmission.

Here's the picture of old gear oil (seems like it has never been changed):

And here's the new oil:

I bought 3 liters of oil but my mechanic told me 2 liters will be enough and you can return the 1 liter (loyal mechanic ).

Since I don't have access to the user manual, I don't know if it's the right quantity for 2010 Corolla Altis 1.8 (manual) ?

Now, the gear shifting feels a bit smoother however there's a slight "Whnnn Whnnn Whoooonnn" noise as you accelerate and especially deaccelerate in 2nd and 3rd gears.

The noise is identical to the noise when you go fast in reverse gear.

This noise appeared after I did the gear oil change. The recommended oil for my car is Toyota GL4 75w 80 and I put the same but still the noise appeared.

Is it normal? Have you guys experienced it after oil change in manual gear? Does it go away after some time?

Was my gearbox used to the old oil and after pourning new thin oil it's happening? Should I have to increase the gear oil grade than the recommended one?

Car is 170,000 driven.
2010 Altis 1.8
Manual transmission

[hash4u]

Car is 170,000 driven.

first time gear oil change ?

[syedhaadofficial]

I'm not sure since I'm not the first owner. From the color of the oil, you can take a guess it was only changed once or never.

[syedhaadofficial]

@rajaatta @autophile @Xulfiqar @syncview @babarhyd @capsat @shaizy007 @gferoz @revengez

I'm not sure if this is related but after the gear oil change, clutch pedal is now making a sound.

10 second video clip of the sound:
https://drive.google.com/file/d/1gZTeLY903_coZOApkoPiG9cdkpXwJ3kj/view?usp=share_link

[capsat]

please access the vehicle id plate in trunk or over the firewall in engine bay- read trans/axle code use google, check out fluid quantity required. add if you poured some short quantity.

the sound at clutch release, perhaps it is thrust bearing delay to disengage from clutch fork. at 170,000 with no fluid change history available i'd change the complete clutch set as well.

[rajaatta]

Agreed

[syncview]

if the oil was changed after a ridiculously long interval, it can happen. only solution is to repair gearbox if possible, replace otherwise
or live with it

[syedhaadofficial]

It means I shouldn't have to change it?

[syncview]

change regularly at intervals of 50000 kms

[syedhaadofficial]

Yes, 50,000 is the recommended one. So, one shouldn't change it if it exceeds 80,000km?

Also, from the color of my old gear oil, could you take a wild guess when it was changed?

[syncview]

its always a risk and no

[syedhaadofficial]

I found it in the trunk. Here's the photo:

I googled but couldn't find an authentic source for the oil capacity required

Also, why did the clutch pedal sound appeared after the gear oil change? Are they somehow related?

[syedhaadofficial]

Got it. Can this sound go away if I increase the gear oil viscosity grade to a higher number than Toyota recommended one?

[syncview]

nopes

[syedhaadofficial]

UPDATE: Gear shifting is pretty smooth now, car drives very well and the noise is minimal.

You can hear it only in 2nd or 3rd gear —if you pay close attention.

Maybe you guys can recommend me a Gear Oil Additive like Liqui Moly that reduces gear noise?

[Xulfiqar]

This sound is the pedal return spring popping or the master cylinder popping, you need to buy the two nylon bushings for the pedal.

[Xulfiqar]

There is no additive to rebuild lost metal.

Another question, was the gear oil filled while car on was ramps or was raised on jack at front only?

[syedhaadofficial]

Thank you! Sounds like an easy fix.

[syedhaadofficial]

It was raised on jack at front only. After pouring, he leveled the car to see if we can pour more.

He added 2 liters. It's a Toyota C50 gearbox

[Xulfiqar]

I believe the c50 takes about 2.3 litres otherwise 5th runs dry.