I have a 2002 SC430 with 53k miles and it is 9 years old.

Today I have the rear differential fluid changed to Amsoil synthetic 80W-90. The old OEM fluid looked opaque but not bad at all. There were a bunch of metal particles on the magnetic drain plug though.

I think the OEM fluid can last longer for sure.

 

I think I read the fluid in our car's diff. is good up to 100k miles...although I'm not sure. Doesn't hurt to change it though how bad was the smell? lol

 

I didn't purposely smell it. But I was a few feet away and didn't notice any foul smell. LOL

I think the Lexus OEM differential fluid is not synthetic (corrent me if I am wrong), so I decided to change it. My BMW OEM differential fluid is synthetic and I haven't changed it for over 80k miles.

 

i recently changed the diff fluid in my wife's '08 with amsoil. It was as clean as what i put in it. Plug was a bear to get to. i forgot what was in the way but difficult to get a straight angle on it.

 

The shop put my car on a lift and used a flexible wrench to get to the drain and fill plugs. You can see both easily. Total cost was $50.

 

so the sc 430 have rear differential fluid?

thanks

 

can you use this Mobil 1 Synthetic 75W-90 Gear Oil on our sc 430 for rear differential fluid ?

please advise,

thanks

 

That depends on if your SC430 has the Synthethic Oil tag on the rear differential.

Info from 2004 SC430 Manual :
Oil capacity 1.35 L (1.42 qt., 1.19 lmp.qt.)

Oil type and viscosity

Vehicles without synthetic oil information label
Hypoid gear oil API GL-5
Above –18C (0F): SAE 90
Below –18C (0F): SAE 80W or SAE 80W-90

Vehicles with synthetic oil information label*
Toyota Genuine Differential Synthetic gear oil
API GL-5 SAE 75W-90 or its equivalent

*Vehicles with synthetic oil information label only:
The following label is affixed on the right side of the
differential carrier. Use the type and viscosity shown on
the label when the differential oil is replaced.

Here is a link to the manual. See page 324 for complete info.
http://drivers.lexus.com/t3Portal/do...m/04sc4/63.pdf