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Registered 2005 SLK350
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A dealer just recommended I replace the coolant, brake fluid, transmission oil, and diff oil. Upon checking the maint manual, it says to replace coolant after 15 years, and doesn't mention rear diff.

I knew I had to replace the brake fluid (more than two years old), and trans oil (past due since I have over 46k miles now)

Did I just get taken for the coolant and differential oil change?
 

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You certainly did on the coolant as now it probably isn't good for 15 years anymore as the chemistry has been disturbed.

Nothing hurt at the differential assuming correct fluid installed.
 

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