If your's is an A7,,,gotta keep that fluid clean & around 180*
Flushed mine very well at 50k without any mods/except drop-in K&N's.
After seeing it look like coffee/but not burn't smelling-i knew i waited too long.
since the 50k flush (12'ish qts.) i do a drain & fill every 5k (around 4.5qts. on level ground)...fluid stay's clean & i actually notice it shifting better/quicker with each service.
about to hit 80k soon & love my A7,,,,if it ever goes out....it's going to Pat@levelten in New Jersey.
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