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IS350 differential fluid change DIY

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Old 05-22-17, 02:38 PM   #106
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Originally Posted by Leander311 View Post
Wow - Lots of good info here... much appreciated, andper10 and redspencer!! From these two UOA's, I'd be more tempted to replace the tranny fluid than the diff fluid, despite Lexus' claims they are both good for the life of the car... What do they consider said "life" to be? If it's 200k, I'm getting close!
My guess is whatever it takes for the owner to get past the factory warranty; then it's not their problem. LOL!
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Old 05-23-17, 08:09 AM   #107
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I just did my diff fluid change after 64k km (not miles) from last change
I don't have UOA but fluid is not pitch black, still quite clear when draining out. And on the drain bolt magnet there is only a very thin film of black residue, nothing shiny or chunky. I think I can extend this one further. Original oil was Toyota dealer oil and I replaced with AMSOIL SG 75W90.
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Old 06-01-17, 06:43 AM   #108
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Same here,
Just did my diff fluid change after 91K miles
Original fluid is much darker when draining out and on the drain bolt magnet there was a black thick goo...
Replaced with Mobile1 75W90.
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Old 06-07-17, 05:02 PM   #109
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Originally Posted by ponteley View Post
Same here,
Just did my diff fluid change after 91K miles
Original fluid is much darker when draining out and on the drain bolt magnet there was a black thick goo...
Replaced with Mobile1 75W90.
can you let us know how many bottles of the mobil1 you used?
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Old 06-07-17, 05:13 PM   #110
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can you let us know how many bottles of the mobil1 you used?
1 and half.
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Old 06-07-17, 07:03 PM   #111
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is gear oil and diferential oil the same thing?
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Old 06-07-17, 07:24 PM   #112
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is gear oil and diferential oil the same thing?
Yes. There are gears inside.
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Old 08-06-17, 01:32 PM   #113
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is gear oil and diferential oil the same thing?

No. You have to read the label. A transmission can have straight cut (noisy but strong) or helical cut gears (these appear as angled). These gears have far less shear induced during meshing than a hypoid gear like that of the rear diff. Notice on a diff the power comes in from one direction and goes out another (90 degrees). Hypoid gears can be destroyed if the wrong fluid is used. That said, a manual transmission can use either while our rear diff requires GL5 lube. Read the label. It must meet GL5 spec of better.
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