Id did a great job on my 300SD with the 617 in it. I would do a plastic bottle purge about 2x a year and the amount of black in the bottle and the smoke was amazing.

I did it once or twice on the SDL with the 603 and the stuff never changed color. I am thinking that is because I run B2 in this car.

The 300SD would run quieter and with a bit more pep after a treatment.

__________________
"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad