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To fill in the blanks from a previous post:
From 1986 to 1987 the 300SDL (126) Had the 603.961 Turbodiesel, 6cyl 3.0L.
From 1990 to 1991 the 350SD/SDL (126) Had the 603.970 Turbodiesel, 6cyl 3.5L.
From 1992 to 1995 the 300SD/SDL (140) Had the 603.971 Turbodiesel, 6cyl 3.5L. (I think...)
(The 603.960 was used in the 1987 300D, W124.)
Back to the original question, it's very likely that the motor in your car is not putting out the original ~120hp that Mercedes intended. You're not going to get much more than the original spec out of it, as "turbodiesel" said, maybe 5hp if you're lucky. However, getting it back to 120hp should be a big improvement! The ALDA adjustment helps a lot if the car is slow off the line. To increase top end power make sure the boost is up to spec (0.85-0.95 bar), and that the lines from the intake to switchover valve and valve to ALDA are clean. Those are the main power robbing items (along with the EGR, if not disabled.)
Regards,
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