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Old 01-09-15, 04:33 PM
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***DIY: Rear Diff Oil Change (w/ pics)***

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Old 10-28-12, 02:14 PM   #1
alchemist
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Default ***DIY: Rear Diff Oil Change (w/ pics)***

2007 GS350 RWD with 80k. Scale of 1-10 of difficulty it is a 3. But messiness is a 7

Disclaimer:Attempt at your own risk. This is the method that I found most useful and efficient –yours may differ and may not be the exact as described herein. As with any do‐it‐yourself project, unfamiliarity with the tools and process can be dangerous. This project should be construed as theoretical advice. I will not be held responsible for any injury due to the misuse or misunderstanding of this DIY project.

Here we go...

Items needed: Rhino ramps, jack stands, jack, 10mm Allen, Mobil 1 synthetic 75w90 gear oil (2 quarts), large syringe or pump (your choice), rags, brake cleaner



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I used rhino ramps then jacked the back up. You could use jack stands at all four corners but it is up to you. I used the diff to jack the rear. Note: try to make car as level as possible!

























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Next step is important. Note the drain plug and the fill plug.

****LOOSEN THE FILL PLUG FIRST!*** WHY? Because if for someone reason you cannot get it to budge you did not drain your oil first. Make sense? I had to use an open end wrench and attach it to the allen for added leverage. Then I broke the drain plug free. Oil was a little dirty -there seemed to be about 1-1.3 qt come out.


Drain plug




Fill plug










Now that the fill plug has been loosened, remove the drain plug











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Look at the metal shaving on the magnetic plug (eeek!). And then the clean plug...












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Return and tighten the drain plug. It is too tight a fit to squeeze the oil into the fill hole with the container it comes in so you must use another device. I chose a large syringe. Add the oil until it slowly drips out. Then return the fill plug. Make sure it is torqued to spec.









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Lastly, I hosed everything off with brake cleaner as it is a pretty messy process. It depends on driving habits, but you should change every 30k.
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Last edited by alchemist; 10-30-12 at 07:19 PM..
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Old 10-28-12, 04:32 PM   #2
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Thanks for sharing,
Have you changed the rear diff oil before on this/your 07 GS? I too agree that 30k is a good interval yet if yours was the first time and it had 80k on it, it looks quite clean.

As for the magnet - that makes me think this "was" the first drain. But the amount on the magnet is very typical for a rear end. Much of that came from the first few 100 miles from new etc..

Cheers
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Old 10-28-12, 04:52 PM   #3
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None of the pictures came up. Am I doing something wrong, or is it my computer?
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Old 10-28-12, 04:58 PM   #4
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how do you like that pump? compared to other pumps that attach on to the bottle n such?

and how do you use that one?
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Old 10-28-12, 05:27 PM   #5
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Quote:
Originally Posted by KJSmitty View Post
Thanks for sharing,
Have you changed the rear diff oil before on this/your 07 GS? I too agree that 30k is a good interval yet if yours was the first time and it had 80k on it, it looks quite clean.

As for the magnet - that makes me think this "was" the first drain. But the amount on the magnet is very typical for a rear end. Much of that came from the first few 100 miles from new etc..

Cheers
So i am the third owner, the prvious were an old guy and a soccer mom. Odds are this was the first time it had been done. It was cleaner than i expected. I wont probably do it again for 50k. I drive my car easy.
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Old 10-28-12, 05:28 PM   #6
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Quote:
Originally Posted by arnieosp View Post
None of the pictures came up. Am I doing something wrong, or is it my computer?
Try a diff comp...they work for me on two separate computers
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Old 10-28-12, 05:32 PM   #7
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Quote:
Originally Posted by vwynn View Post
how do you like that pump? compared to other pumps that attach on to the bottle n such?

and how do you use that one?
I actually dont like it very much and am going to buy a diff setup soon. It is messy as hell. You basically stick one end in the bottle and pull the plunger out with the other end. It doesnt have a perfect seal so it leaks when you take the plastic end out of the fluid. Now imagine doing all of this on your back under the car. Best scenario is if you have a friend doing it for you and then hands it to you. The other bad thing is it is impossible to clean well.

I plan to buy the pump that attaches directly to the bottle. You can get these electrically powered too
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Old 10-28-12, 08:49 PM   #8
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Here is the other type of pump:

Amazon Amazon
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Old 10-30-12, 12:15 PM   #9
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Cool write up!!!
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Old 10-30-12, 12:18 PM   #10
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Nice DIY write up!
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Old 11-13-13, 06:56 PM   #11
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MOBIL1 is a good diff oil or is it recommended or doesnt matter, whichever is good/available.
I usually put Penrite but on their website it says to use toyota oil?
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Old 11-13-13, 08:08 PM   #12
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I am sure the Pro Gear oil from Penrite is just fine and equivalent to toyota gear oil and mobil1
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Old 11-13-13, 09:22 PM   #13
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a few notes for others:
-when you have the car raised, you want the front and rear of the car as level as possible. this will ensure proper drainage, as well as proper fill amount (fill til fluid starts coming out the fill hole.)
-the front crossmember and the rear dif are the usual jacking points called out by the factory service manual of almost every vehicle, in case any of yall were iffy about it.

using jack stands
the way the jack stands are under being used is incorrect.
the seam/pinch is not supposed to be used to support the weight of the vehicle. the seam/pinch will eventually fail and bend/fold over. it is the space directly to the right/left of the seam/pinch that is supposed to bear the weight. to do this, one would have to acquire special adapters for the jack stands, or make a cut in your current jackstands.

can you 'get away with' putting a regular jackstand ON the seam/pinch? perhaps...
perhaps the worse thing that will happen is that itll flatten out. we just dont want it to flatten out
while youre under the car, that can be bad.

lastly, never work under a car that is ONLY supported by a floor jack or scissor jack. a scissor jack can fail as well as a floor jack. only work under a safely supported (jack stands and/or ramps) vehicle.
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Old 11-14-13, 04:38 AM   #14
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Well done. I'll have it done soon when I do my timing belt as well.

I'm not a fan of jacking up the car from the differential. It was never designed to carry the weight of the car from that angle . I don't let anyone do it with any of my cars.
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Old 11-14-13, 09:32 PM   #15
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i dont have a copy of your car's fsm, but this is from the sc300 FACTORY service manual
Click the image to open in full size.
if the factory (and many many other automotive manufacturers) tell you to jack the rear from there, youre probably good to go.
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