During the 18 years I drove my W123 300TD, the M.B. dealer recommended adding a full bottle of Red Line diesel additive to every full tank of fuel since the diesel quality here is the worst in the world.

The Red Line worked excellent, saving a lot of problems that plagued many other 300D/TD's that did not use it.

A. Rosich
S320, 1998
E320T, 1995