You could also run 100% diesel 911 through. It's main job is to undue gelled diesel from the cold, but it's a good solvent also. ATF will free up the pump also.

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800