So I'm driving to work today and the maintenance minder turns on, giving me codes B1 and B5. B1 rotate tires, ok I get that. Need to do that. B5 is the transmission fluid. I'm at 68K and changed the transmission fluid at around 60K.

So I get to work and pop the hood and check the dip stick. Color is a light brown and the fluid is just edging the "HOT" zone on the stick. Is it really time to change it again so soon? I thought after the first 60K change, it's every 30K after that. Any advice or insight is appreciated.

 

5 is replace engine coolant.

Even if it were "3" I'd go 30K at least between ATF drain/fills. The MM works on operating conditions and doesn't know you changed it 8K ago.

My "3" code just came at 71K and I changed at 60k. I'll let it go until 90...

 

Sorry it was B3. I was just looking at the manual and thinking I should change the coolant since it's been 5 years. So I guess I'll let it go till 90K then, unless I feel something weird in the gears. Thanks.

 

so when is it required for manual trans fluid changes?

 

At mm 3 or whenever the mood strikes you.

I'm not sure when MM3 comes up, before this month I thought it was over 100K but 70K seems more likely. This is for A/Ts. Manual transmissions should need less frequent oil changes.