S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

5 cyl. injection pump need oil?

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Old 09-27-2020, 10:08 PM
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1982 Mercedes-Benz 300SD
5 cyl. injection pump need oil?

I have driven a diesel since 1975 and never paid attention to the red filler cap on the injection pump. Is that OK?

Last edited by ad4nr; 09-27-2020 at 10:12 PM.
Old 04-10-2023, 06:26 PM
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1985 300SD, 1990 300SE, 2002 E320 Wagon RWD.
Shared with motor oil

Diesel injection pumps get their oil from the engine. Not sure what red cap you are talking about.

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