Just need a quick answer. My 400e has 215,000 miles on them and the shocks have never been replaced. Ive been getting a horrible sqeaking sound and im pretty sure its the shock seeing as though i have lubricated every joint with wd40 at least 3 times.

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1993 400e
Charlotte

well, my 300E's rear shocks were shot at 192k. The fronts were fine when I sold it at 204k but they may have been replaced by the p/o.

try bouncing the car/looking for fluid leaks. Should be pretty obvious if they're knackered.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

Replacing shocks at 215k on a 400E would not be considered wasteful or extravagant. If they are not leaking fluid it may not yet be necessity - there are certainly cases of 300k life. But 215k is at a stage where you will probably see a noticeable improvement in ride - with the added bonus that it may stop the noise.

If by Inspecting the shocks, you see visual oil leak marks on them, then shock need to be replaced. But squiking noise could vert well be some thing else. I was having squicking /grunting sound, thought it was shocks. Changed all four of them, the sound was still there. Later found out it was guid rod mount. I am not sure what you mean by "lubricated every jont" since all the joints are sealed on these cars and do not have lubrication nipples.
By visually inspecting if the boot on the guid rod mount is torn, that is the culprit. Another item to check for is, Lower control arm bushing. Take your time and trouble shoot, do not through parts on the problem.
Hope it helps.

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87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)

Mine were still ok at 241k but they were leaking and due. It might not be a bad idea to replace them the car might ride a lot better.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200