Add it twice more. Rust Rust Rust!

Also see how the transmission shifts, and check the blowby. If you can start it cold, or with minimal glowing and see how it starts.

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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