This is my first Lexus and first new car in a long time. I have a 2015 3IS RWD and looking through the Services Guide I don't see any service interval for replacing the rear diff fluid or the trans fluid. All the manual says is under "inspect the following" check diff fluid level and check trans for leaks--and that the trans is a closed unit with no dip stick.

As far as my automotive knowledge goes, all transmissions are closed and yet many in the past have had dip sticks. Also, I've never heard of just topping off diff fluid if you're low. And both definitely have had service intervals! I change the diff fluid in my S2000 every 15K miles.

I find it hard to believe that the Diff and Trans fluid doesn't EVER need to be replaced. Does anyone know the service intervals for these two and the fluid weights?

 

transmission is sealed, people in 2IS have done a transmission fluid analysis at 125k miles and blackstone said it looked good. Early 2IS said diff fluid at 60k but then later it disappeared from the schedule since. Diff fluid is really easy to change if you prefer.

 

ok thanks for the info! I guess I'm getting old and don't know about all these new technological advancements haha

Maybe i'll check my diff fluid at 60K and see if it's black... Thanks again

 

For the 2IS, they changed the the type of oil in the differential before removing the service from the maintenance schedule.

 

new cars have dramatically lower maintenance requirements. 10k oil changes with synthetic, no timing belts, hardly any fluid changes, toyota/lexus have that 100k mile pink coolant. Only really major things are spark plugs at 60k but even then its not that hard. Brake pads are very easy to change out.

 

Good to know, thanks! That's great news.