Hey everyone, as my other post said I just bought a new W140 S500. It has 78,000 miles. From dealer history the coolant has been flushed, the tranny fluid has been flushed, oil changes, etc. I am trying to figure out what preventative maintenance I should be thinking about at this point?

I was doing some searching, and I saw a few posts about a plastic heater hose T that breaks...I will replace that. I plan on cycling out the power steering fluid and brake fluid. Do I need to do anything with the hydraulic suspension (this one does have the separate reservoir for it so I know it has the hydraulic system)? What kind of fluid should I be putting in there, and is there a procedure for flushing it out? Thanks for any tips!

__________________
97 S500 (90,000 miles) - wife's car
87 300D (298,000 miles and a replacement #14 head)
94 Suburban K2500 - need something to haul firewood
83 300SD (343,000 miles) (sold)