Straight 10 weight is good. That is what you want. I'm not so sure about the non-detergent part, but at this point it probably doesn't matter. Just remember to include the Lucas mucus and Trans-X again.

Just for grins I'd turn in that T-bar BEFORE this fluid/oil change so that you can evaluate the T-bar mod by itself. You have nothing to lose, you aren't going to hurt anything, and you might even be able to avoid another fluid change! (Which surely must be getting old by now!)

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89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.