Do I Really Have to Replace the Rear Diff and Transfer Case Oils?
Lead Lap
Joined: Mar 2015
Posts: 4,513
Likes: 345
From: In your head
If following the intervals isnt in the books, one could shift to using longer life aftermarket fluids.
HPL comes to mind, and they love to address questions regarding use, application method, and service life.
HPL comes to mind, and they love to address questions regarding use, application method, and service life.
Instructor
Joined: Feb 2021
Posts: 835
Likes: 408
From: PA
My single owner 2017 RX350 is AWD with about 30,000 miles. The car is constantly garaged and never driven under harsh operating conditions. I have seen on the Forum numerous DIY posts on changing these fluids, but I no longer work beneath the car and would bring it to Lexus for these fluid changes.
The question is whether I really need to change these oils. Looking at the Lexus Scheduled Maintenace Log, starting at 15,000 miles and then every 15,000 after that, the recommendation is to replace the fluids. But ONLY if operating under their listed (severe) operating conditions, and NEVER under regular driving.
I really want to be kind to my car, but not obsessive about it. So, I question how important it is to replace both fluids. Interested in everyone's thoughts.
The question is whether I really need to change these oils. Looking at the Lexus Scheduled Maintenace Log, starting at 15,000 miles and then every 15,000 after that, the recommendation is to replace the fluids. But ONLY if operating under their listed (severe) operating conditions, and NEVER under regular driving.
I really want to be kind to my car, but not obsessive about it. So, I question how important it is to replace both fluids. Interested in everyone's thoughts.
The question always comes down to "how long are you keeping the car?" If it is 50k to 100k then follow the manual. If you are long term like 120k or more then follow "The Car Care Nut".
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