At how many miles should the rear differential fluid be changed? Has anyone have this done yet?

 

Only inspection for leakage is recommended through 150,000 miles. Replacing the differential gear oil anytime before [say] 100k miles at the earliest is a total waste of money.

 

That's my point.I'm at 103K miles right now.

 

Awesome that your GS has hit the 100k mile club mark! Any major issues or problems along the way? I had my rear differential fluid changed at 47k even though the recommended change isn't until 150k as mentioned by fellow member bclexus. Here's a few helpful threads about the front/rear differential fluids:

https://www.clublexus.com/forums/gs-...id-change.html
https://www.clublexus.com/forums/gs-...ial-fluid.html

 

 

It doesn't hurt to change it sooner especially the first change. The original break-in debris stay inside the diff and you'd want to get it out.

I've changed both my front and rear diff at 60k, and sure glad I did. There was a good amount of material on that magnetic drain plug. I plan on keeping the fluid there for longer than 60k beyond the first change though(maybe 80-100k).

The fluid I used is synthetic which I trust way more than the original Toyota conventional fluid for the Canadian winter climate.

 

I actually changed the rear diff fluid at 800 (Yes, Eight hundred) miles in my 2017 GS350 RWD. I was shocked at the amount of material that was on the magnetic drain plug - it was completely covered. I plan to change it again at 5,000 miles, then after that, will probably do it every 30-40K miles.

 

I have AWD, changed both the front and rear at 62,000 miles. My trusted Toyota master tech of 14 years at Toyota took care of it. Replaced both with 75-90 Synthetic.
Upon draining, he said it looked normal for a first drain at those miles, no issues. Magnets had some shavings from break in, again all looked normal.
Total at Toyota for both $163.00. Will do it again in 40,000 miles.