The oil and fuel cap are the same. I lost my oil cap once and used the fuel cap to get home, but I ended up with diesel all over the side of my car AND oil all over my engine.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine