I thought the shop that sold you the disposable Nitrogen tank said it would be more than enough to do the pressure testing? Unless you had a real big leak? Did you test your test setup for leaks first? What pressure were you able to get it up to?

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked