Changing differential fluid - Lexus IS Forum
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post #1 of 22 (permalink) Old 04-05-2019, 11:27 AM Thread Starter
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Changing differential fluid

Have 200k miles on car never changed any tips? Some say use Mobil 75w 90 oil. Do I need fo add any additives? Thnks
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post #2 of 22 (permalink) Old 04-05-2019, 01:19 PM
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I did this about 7,000 miles ago and didn't add any additives to mine and it is still running great with no problems. had 240K miles on the car.
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post #3 of 22 (permalink) Old 04-05-2019, 05:16 PM
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Originally Posted by Beeeastman1 View Post
Have 200k miles on car never changed any tips? Some say use Mobil 75w 90 oil. Do I need fo add any additives? Thnks
No additives. Just use the 75/90 in a GL5 ratting.
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post #4 of 22 (permalink) Old 04-05-2019, 05:17 PM
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The Y38 on my IS works well with valvoline 75w90 synthetic, no additives.

2003 IS300 5MT
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post #5 of 22 (permalink) Old 04-05-2019, 09:18 PM
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You want to try to break the fill bolt loose before you take out the drain bolt. Just in case the fill bolt is stuck.
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post #6 of 22 (permalink) Old 04-06-2019, 05:55 AM
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The bolts are hex caps 10mm. If it seems like it wont release, use a plumbers torch to heat the bolt head until it smokes, then try again. The washer is aluminum and dissimilar metal will oxidize together. Heat breaks the bond. Just be careful of what around what you are torching.
When you put it back in, put antiseize between the washer and bolt head, not on the threads.

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post #7 of 22 (permalink) Old 04-06-2019, 09:52 AM Thread Starter
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Thnks! Any thoughts on using the Walmart supertech 75w 90 synthetic gear oil? It’s like $6 a quart compared to like $14 for Mobil 1
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post #8 of 22 (permalink) Old 04-06-2019, 10:24 AM
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The fresh Walmart lube is definitely better than 200k used lube...

However, consider all the load being transmitted by your diff - and consider there's only about 1.5 liters of fluid to absorb all the heat generated.

Then consider that Mobil 1s ability to resist heat break-down is extremely well proven.

$8 difference over the course of 50k-100k miles seems pretty insignificant to me, but your milage may vary.
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post #9 of 22 (permalink) Old 04-06-2019, 10:25 AM
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Oh yeah - don't forget to change the transmission fluid while you're at it!
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post #10 of 22 (permalink) Old 04-06-2019, 11:15 AM Thread Starter
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Should I change the automatic tranny fluid at 200k miles I don’t know if it has ever been changed
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post #11 of 22 (permalink) Old 04-06-2019, 11:32 AM
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You'll get varying opinions on whether or not to change old crappy automatic trans fluid... Something about fresh fluid with detergents cleaning out built up nastiness and screwing everything up.

I'm of the opinion to change it. I've changed old crappy fluid, greatly improved shift quality, fixed torque converter shudder, and not had the transmission fail.
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post #12 of 22 (permalink) Old 04-07-2019, 06:41 AM
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At one point I didn't want to change the fluid on high mileage auto's but I've been forced to do complete drain and fills a couple times with different IS300 transmissions (because I removed, disassembled and reinstalled) and it's never caused me any issues.

I have a 150K mile transmission I did this too. Checked clearances. The front pump was right at the wear limits. So, not changing the fluid clearly causes wear.
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post #13 of 22 (permalink) Old 04-08-2019, 12:26 AM
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You'll get varying opinions on whether or not to change old crappy automatic trans fluid... Something about fresh fluid with detergents cleaning out built up nastiness and screwing everything up.

I'm of the opinion to change it. I've changed old crappy fluid, greatly improved shift quality, fixed torque converter shudder, and not had the transmission fail.
Im the same thought, id rather have fresh fluids doing the work and know its good than have it crap out in the middle of nowhere cause the fluid was well past it. I still remember an uncle who would not change his fluid for so long the car wouldnt drive up our driveway and had to be towed out.

I have changed fluids on a few cars including my IS and it made a significant change to the shifting (some felt not what i was expecting), making me think either its never been changed or someone has thrown the wrong fluid in there in the past.

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post #14 of 22 (permalink) Old 04-10-2019, 09:50 PM Thread Starter
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Thnks all! Just curious what is the recommended change or maintenance interval for the diff fluid on the is 300? And for first gen is 300 is the oem trans fluid the Toyota IV fluid?
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post #15 of 22 (permalink) Old 04-10-2019, 09:51 PM Thread Starter
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One more? Should I bother ordering new crush washers for the diff plugs? And are they both the same size? (Ie. The drain and the full plug)
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