My 150K service is fast approaching. I am a strong supporter of preventative maintenance. Recommendations for what to add/remove from my list would be greatly appreciated. What tends to go wrong with this model as it ages?

-air, fuel, oil, tranny, pwr steering filters
-ALL fluids
-distributor cap and rotor
-fuel pumps?
-injectors?
-O_2 sensor
-spark plugs and wires
-timing chain?
(new airbag, belts and tensioner,brake pads, radiator, water pump already done)

Surprisingly, a new belt tensioner was the only service this car's A/C system has had. I figure this is very rare; should I have it checked too?

Benzmac & crew: Thank you for your ongoing support of those who can't resist servicing their cars themselves–maybe the cars make us do it! Apologies for a long post.

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89 190E 2.6
83 300TD Turbo
75 240D

If it ain't broke don't fix it.

Maintenance is different. I never replace cap and rotor on MBs as routine maintenance. I very seldom replace parts from a preventative stance. At 150k a virgin cap and rotor might be good maintenance, but so would a radiator and water pump; where do you stop. Radiator necks break off quite frequently somewhere above that mileage.

I would do a standard 30k service. The one thing you don't get when you do it yourself is a look-over by someone like myself. I can drive that car and walk around underneath it and pick out more in 15 minutes than an unfamiliar tech or DIYer could in a week (or maybe forever). This may be the most important part of good maintenance!

Thanks for the suggestions! I should mention that I do have a tech I take it to; he's just too far away to be practical for DIY things.