LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

How often do you change your differential oil?

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Old 02-09-13 | 05:32 PM
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Originally Posted by ProperD
also, im not sure about toyotas, but in most transmission, at least in the nissan world, call for GL 4, so dont put a gl5 or gl4/5 hybrid oil in the transmission.
Originally Posted by ls400geek
From the 1998-2000 LS400 Service Manual :



I think I'll stick to what the service manual says and use API GL-5.
He did say transmission.
Old 02-09-13 | 05:38 PM
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BITOG forums generally come to a consensus that 75w-90 syn is a perfectly fine replacement for most applications calling for GL-5 aka 80w.

I run 75w-90 just fine.
Old 02-09-13 | 07:58 PM
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Originally Posted by PureDrifter
BITOG forums generally come to a consensus that 75w-90 syn is a perfectly fine replacement for most applications calling for GL-5 aka 80w.

I run 75w-90 just fine.
I remember now, they have the GL-5 and other certifications on the back of the bottle. I had the dealer put my Lucas Oil in without any questions because it is the same ratings but better quality. Replacing the washer and bolt each change is smart too.
Old 02-09-13 | 08:59 PM
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Originally Posted by ProperD
if you guys plan on changing out dif or trans oil, might as well go ahead and buy a new, MAGNETIC drain plug. it could probably be had for $10-15 online. the next step after that, if you have the time and means, would be to swap out that dif gasket even if it isnt leaking.

also, im not sure about toyotas, but in most transmission, at least in the nissan world, call for GL 4, so dont put a gl5 or gl4/5 hybrid oil in the transmission. the reason is that the trans uses yellow metals (copper/bronze/brass) and GL 5 has more (twice as many as gl 4) sulfur additives that are will attach/eat those yellow metals. the diff doesnt have yellow metals and those sulfur additives help keep the gears clean/lubed. after visiting autozone, pepboys, and oreilly, napa is the only place i found that has gl 4 oil.

i know thats a lot of unasked for info, but im just trying to help yall out
Ls400 do not have manual transmissions, therefore they use ATF
Old 02-09-13 | 09:02 PM
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Originally Posted by sha4000
He did say transmission.
Sorry, I read that as "differential"--since this is a differential oil thread and I've never heard of anyone using anything GL in a transmission (only Type F, Dex III, Toyota T-IV etc..) EDIT: Ok I read on, I guess they use gear oil in manual transmissions? I've never changed manual transmission oil before--always serviced cars with automatics.
Old 02-09-13 | 09:03 PM
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Originally Posted by Lavrishevo
Replacing the washer and bolt each change is smart too.
Why is is smart to replace the bolt and/or magnet? Does the bolt get weak? Does the magnet get weak?
Old 02-09-13 | 09:21 PM
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Because of how cheap it is. Especially, on a transmission. Preventive maintenance.
Old 02-09-13 | 10:35 PM
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Originally Posted by ls400geek
Why is is smart to replace the bolt and/or magnet? Does the bolt get weak? Does the magnet get weak?
the threads on the plug strip.
Old 02-09-13 | 10:41 PM
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Just to note, they also strip because whomever wrenching them is heavy handed. Most these fasteners have a wide margin for torque specs so if unsure how much you are applying, a torque wrench is good practice. This also means buying a reasonable torque wrench that isn't off by a huge margin.
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