Also, which Mercedes fluid should I use for the 722.6
I still have 5-6 bottles of the 722.6 fluid from 3 years ago. Should I add more 722.6 fluid or the new 722.6/722.9 fluid? If the latter, are they compatible?
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2008 S550
2010 GLK350
1997 E420 (retired)
2005 CLK500 (retired)
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