Differential Fluid Recommendation
10-09-21, 12:26 PM
#17
I am planning on servicing the differential on our 2013 GS350 F Sport that just hit 60K.
I do not want to use the Toyota factory fluid....
I am considering Mobil1 75w90 Synthetic LS or AMSOIL 75w90 Synthetic.
I believe 2 quarts should do the trick.
Any real world guidance?
Thanks in advance.
FYI, I will service the transmission with Idemitsu ATF; it's good stuff.
I do not want to use the Toyota factory fluid....
I am considering Mobil1 75w90 Synthetic LS or AMSOIL 75w90 Synthetic.
I believe 2 quarts should do the trick.
Any real world guidance?
Thanks in advance.
FYI, I will service the transmission with Idemitsu ATF; it's good stuff.
10-12-21, 09:54 AM
#18
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I used Royal Purple 75W-90 + a Cheaper off brand GL-5 equivalent for the .3-.4 litres that you need on top of the 1L, the manual says 75-85w (but it's. impossible to find and barely difference in viscosity between 85-90). The first diff fluid change will contain a lot of shavings, take your time and fish out the shavings from the holes using the magnet on the drain plug. Gl!
10-12-21, 01:02 PM
#19
Instructor
I used Mobil-1 75W-90. The difference between 75W-90 and 75W-85 will never be noticed.
I used it in both the front and rear diff on mine and 1,000 miles later, I can't tell any difference. Also, the old fluid wasn't bad but I got all the break-in metal off the drain plugs.
I used it in both the front and rear diff on mine and 1,000 miles later, I can't tell any difference. Also, the old fluid wasn't bad but I got all the break-in metal off the drain plugs.
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JeffKeryk (10-12-21)
10-12-21, 03:00 PM
#20
Racer
I recently hit 100k mi in my 2013 awd.
I figured front and rear diff fluids couldn’t hurt.
Rear fluid looked incredible: still transparent yellow, only a bit of thick gray paste at the magnet. That fluid could have gone another 50k miles easily.
Front fluid showed more age: darker amber, still quite transparent up close but much darker than the new fluid. Very thin paste at the magnet. Getting at the fill plug in the front is tricky, very hard to get back in with larger hands.
I used gl-5 75w85 for the rear and gl-5 85w90 for the front. Also ordered a set of transmission and diff replacement washers for like $6 on amazon, includes what you need to replace any of them.
I figured front and rear diff fluids couldn’t hurt.
Rear fluid looked incredible: still transparent yellow, only a bit of thick gray paste at the magnet. That fluid could have gone another 50k miles easily.
Front fluid showed more age: darker amber, still quite transparent up close but much darker than the new fluid. Very thin paste at the magnet. Getting at the fill plug in the front is tricky, very hard to get back in with larger hands.
I used gl-5 75w85 for the rear and gl-5 85w90 for the front. Also ordered a set of transmission and diff replacement washers for like $6 on amazon, includes what you need to replace any of them.
Last edited by jonathancl; 10-13-21 at 10:01 AM.
09-07-23, 12:04 PM
#21
I'm guessing you think the Toyota/Lexus engineers don't know what they're doing...
While your non-Toyota lubrication choices for the differential should be fine, I'd be very wary of using anything other than Toyota WS automatic transmission fluid in the transmission. Transmissions cans be very finicky about even a slight change in the fluid used...and Toyota transmissions are no exception.
While your non-Toyota lubrication choices for the differential should be fine, I'd be very wary of using anything other than Toyota WS automatic transmission fluid in the transmission. Transmissions cans be very finicky about even a slight change in the fluid used...and Toyota transmissions are no exception.
Last edited by GS350awdbase; 09-07-23 at 12:08 PM.
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JeffKeryk (09-08-23)
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