Date registered: Aug 2006
Vehicle: 2002 ML320, 2003 A160
Location: Brisbane, Australia
Mentioned: 1 Post(s)
Quoted: 430 Post(s)
You probably don't need to do any of the extra work immediately. The coolant flush should be done every 3 years, so if it's due and you don't have the time/desire to DIY, then give them the OK on that. Unless you want to visit an indy for it, which means more inconvenience and no free loaner, just to save a few $$.
The MB battery tester has a very low threshold for the "replace battery" advice. Better keep your old one until it dies.
Tires you can check yourself. If they're worn down to the wear indicators (5 mm transverse bands across the tread every 60º or so) then replacement is due.
If the car drives straight and the tires wear evenly, then wheel alignment is inadvisable. At worst, they could un-align the perfectly good alignment you have now.
The suspension can be checked by a specialist workshop who offer free inspections. If I OK'ed every MB workshop recommendation to replace suspension on my car, I'd be short $3000 by now. (torsion bars, bearings, ball joints - all still fine and independently checked)