Hello,

I have a 2015 RX350 AWD. It is getting close to 90k miles so I want to do a complete Fluid change overhaul. Am I missing any fluids?

-oil change obviously
-coolant
-power steering
-brake fluid
-transmission fluid
-rear differential fluid

There is no Front Differential fluid for our cars right? And what about the Transfer Case… is there a transfer case fluid exchange???

Thanks for all the input!! Just want this car to last to 200k with no issues!!

 

If you are open to inputs why not start with manufacturers recommended service items [specially catch up on the ones that have been missed]. These items are listed in the thin manual warranty and service. You can overdo the listed items or follow suggested services for adverse conditions.

If you read through posts here members suggest to replace transmission fluid every 60k miles and replace engine oil sooner [6k seems to be the most talked about number. Most folks also say not postpone spark plug change but I have not seen any specific suggestion.

My view is not to postpone anything but overachieve on the transmission fluid change. I also keep my service history logged in the book mentioned above.

Salim

 

There's no power steering fluid on these. It's electric

Front diff is inside the transmission/transaxle so it shares the fluid with it

Transfer case and rear differential takes 0.6L of GL5 gear oil. You could probably get away with a single bottle and fill both to 0.5L. Make sure you replace the crush washers (x4) with OEM ones so you have no leaks

Brake fluid 1L

Coolant - 2 jugs unless you want to flush it all out

 

For my 2015 RX350 AWD I used about 3.5 quarts of Valvoline Max Life transmission fluid for my transmission fluid change without removing the transmission pan. Years later the transmission still shifts smooth.

I used Valvoline 75w-90 full synthetic gear oil for the rear differential and the transfer-case. I only needed about 1.5 quarts of gear oil to service both the units. Front differential is lubricated by the transmission fluid.

I used Zerex Asian Toyota coolant for my coolant change. I just removed the lower radiator hose and drained out the old coolant and then refilled with fresh coolant. I will repeat the process after my next oil change to remove more of the old coolant. I needed about 2 gallons of coolant for the radiator drain and fill.

Electric steering rack so no power steering fluid.

I used Bosch ES16 brake fluid for my brake fluid flush. I only needed about 1 quart of brake fluid to flush out the old brake fluid.

I used about 6.5 quarts(closer to 6.4 quarts) of Valvoline 0W-20 High mileage full synthetic oil and factory Toyota oil filter for the engine oil change. I change my engine oil and oil filter about every 5k miles.

 

Awesome thank you guys for the detailed info, I really appreciate it!!