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Thought I would share what the color of my transmission and differential fluid looked like after 18K miles. I'm in a 2015 Premium. This includes 4 track weekends. I know the recommended changes are much less frequent, but couldn't help myself. Post change, it would appear this was not needed. I'll admit, I'm no expert. What do you guys think? Was this overkill?

Transmission:


More Transmission:


Even more Transmission:


Differential:


More Differential:
 

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Can't really tell from color alone. But 4 track days for diff fluid is probably good. Transmission can probably last longer but depends on how hot they got in those days.

Overall, that is probably what I would do too, but new engine oil after every track day.
 

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gta88ws6
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832 Posts
i did my 2015 trans at like 13000 miles, diffs too. Search my posts...

Youll see that even that early my fluid was dark, diffs fluids were junked.

I also took the valve body down and wiped off the pistons as they had a fair amount of metal on them.

sent from my phone...
 
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