Although many changes were made throughout the life
of the M129 SL body shape, the major changes were only
to be an increase in engine capacity - and although the
250SL's power was almost identical to the 230SL, its
larger capacity motor did have more torque.
Safety improvements also led to 4 wheel disc brakes
being fitted and a softer "pressure absorbing" steering
wheel being fitted.
The 250SL was only in production for one year, and was
soon replaced by the larger engined 280SL.
This has lead
to some debate amounst Mercedes fans as to which model
is the more collectable, the superior performing 280SL
or the low volume 250SL. Certainly from a rarity point
of view, the honours must go to the 250SL.