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ALDA is altitude sensitive so you don't need to make any adjustments. Sixto's vacuum amplifier is usually called the "blue flying saucer." Its job is to mimic gas engine intake manifold vacuum, since Mercedes uses pretty much the same transmission for both gas and diesel cars. The vacuum level tells the transmission how hard to shift and the Bowden cable (attached to the throttle linkage) tells it when to shift.Your #2 picture doesn't show quite enough of the left inner fender to see if the blue flying saucer is there or not. If the car shifts OK, no worries.
A low oil light can be caused by a number of things. My '87 has to be 2 quarts low before the light will come on whereas my wife's '96 E300D, using the same float switch in its OM606 engine, isn't happy unless the oil is at or near "full." Different engines seem to react differently; I can't explain it. Next time you change oil you can pull the sender (left side of the oil pan) and make sure one of its vents isn't clogged. The sender is not expensive and easy to replace.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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