Squealing from undeneath

[CostaRica2021]

Bought a 2015 Toyota Fortuner in February 2021. Last owner did not care for it properly. About a month ago, a strange squealing started under the vehicle, about a kilometer into each trip. It only sounds when the vehicle is at low speeds (45 kph), stops when the vehicle stops and does not increase/decrease with the vehicle's speed. New oil, new brakes, new serpentine belt/transmission fluid and transmission filter. Mechanics can not find the source. All fluids and systems seem to be working correctly. No leaking fluids. Link is to Youtube video I took of the sound with a GoPro under the vehicle. Any help is appreciated. Youtube link: https://youtu.be/gkLE8PBsXmk

[White One]

im not sure , but suspect its the CV joint seals , where the CV joints go into the front differential. Spray the inner parts of the joint ( where the seals are ) with something like WD40. can you hear the noise if you jack up each side and spin the wheels by hand?

[CostaRica2021]

im not sure , but suspect its the CV joint seals , where the CV joints go into the front differential. Spray the inner parts of the joint ( where the seals are ) with something like WD40. can you hear the noise if you jack up each side and spin the wheels by hand?

The below picture is the closet I can get to the front differential. As you can see, I sprayed WD-40 in there. Did I get the correct location? We drove about 20 km and no squealing. But the sound initially was hit or miss when the squealing started a few weeks ago.

Just moved to Costa Rica so I do not have equipment I need to lift the Fortuner right now but will next week. Thank you.

[White One]

Ok let us know how you go. This forum is usually for the Australian delivered models so i dont know if they are different to the Fortuners built in Sth America. I think they use the 1KD engine and 5 speed gearbox over there

[CostaRica2021]

Good to know. I will update when I have relevant information. Thank you.

[White One]

yes , needs to be further in there , right where the seal covers the shaft into the diff. I have heard of that seal needing replacement for that same noise.

[CostaRica2021]

yes , needs to be further in there , right where the seal covers the shaft into the diff. I have heard of that seal needing replacement for that same noise.

Ok. Squealing started again this morning. Pulled over and sprayed into that pictured groove (on both sides). Squealing stopped again. Thinking you identified the problem (thank you very much). Will I get more 'time' if I use something like a white lithium oil? Is white lithium safe to use here? I have to find the parts and this is our only vehicle.

[White One]

I dont know if oil will work long term , I think its a fault with the seal of some kind , or there is some dirt or something stuck in there. Probably best to replace the seal next time it gets a service

[CostaRica2021]

I dont know if oil will work long term , I think its a fault with the seal of some kind , or there is some dirt or something stuck in there. Probably best to replace the seal next time it gets a service

Yes, replacement is the plan. I truly appreciate the remote diagnosis. When the seals are replaced, I will update to report if the problem is solved. Drive safe!

[CostaRica2021]

Turned out to be a bearing seal in the front. Fixing it 12May. Thanks again.

[White One]

great news , happy to help