From what I'm reading I should do the following:

(1) Remove valve cover and check for any loose lifters. If any, change them. Do I change them all or just the ones that are loose?
(2) Check Timing Chain - how do you properly check the timing chain? If not in spec, go ahead and replace, with new guides.
(3) Replace timing chain hydraulic tensioner. Can you reuse a new tensioner or is this a one shot deal?

Is this correct?

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200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI