I was browsing through the maintenance schedule from Lexus Canada to see if any services changed throughout the second generation. I noticed some services were not listed for AWD from 2010-2013 when comparing to AWD from 2006-2009.

Replace Automatic Transmission Fluid - Every 96,000 Km
Replace Front Differential Fluid - Every 64,000 Km
Replace Rear Differential Fluid - Every 64,000 Km

Why doesn't 2010-2013 need maintenance on the three services above?

 

According to my SA at Lexus dealership (in US), 2006-2009 2nd IS uses standard fluid than 2010-2013 therefore there are services that needs to replace the fluid/differential.

I read a lot on the forum saying the transmission/differential are using WS fluid and never need to service, but it's for model 2010+

 

I never knew transmission and differential fluids are lifetime for model 2010+. That explains why it's not included in the maintenance schedule. My differential fluids service is coming up soon. Thanks for the info .

 

no fluid is "Lifetime"

 

its really easy to change the diff fluids

lifetime of the transmission