From what I can remember,

*Power seats,

*Telescopic wheel,

And that's about it. My sister had a 260E with both those options.

on the 1990 300E 2.6 vs the 300E,

*Leather also

There really was not much difference between the two. Just a fewer options, and a minor performance gap compensated by a 3.27 rear-axle for the 260E vs a 3.06 for the 300E.

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1987 300SDL (324000)

1986 Porsche 951 (944 Turbo) (166000)

1978 Porsche 924 (99000)

1996 Nissan Pathfinder R50 (201000)