That is what happened to me. I stayed away from the 'troublesome' 603 until I needed to replace my 300SD. I would never go back to the 5 cylinder now. The 603 is on the original head (#14) and has 320,000 miles on the clock. I have put 70000 of them on it and the engine has never let me down. It is smoother, quieter, much faster, and in a bigger heavier car returns between 2 and 5 mpg better than the 300SD ever did!

Now I want to get a 603 powered 300D to go with it...

__________________
"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