I did a diesel purge on the '85 after running B100 for several months and I didn't notice any change at all and the stuff coming out of the return lines looked about the same as the stuff that went in. I have yet to give it a try on the '84 but I wouldn't expect it to do much.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo