Low mileage 2009 6MT maintenance

With a 2/09 production date E92 M3, I just hit 17k miles. Warranty has expired and no plans of an extended contract. What maintenance is a priority?



Car has had 3 services:



1100mi : Oil, Differential oil, Transmission oil

6700mi : Oil

1300mi : Oil



Oil maintenance will remain at 7000mi intervals. Next change at 20,000mi.



Based on age, what should be done or is overdue?

Spark plugs? Power steering? Trans/Diff fluid? Coolant?



BMW calls for Trans/Diff fluid change every third oil change. (Will be my 4th)



Thanks in advance