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Well I ran the 300SD for 100K on synthetic and the engine was real clean inside. I would say that for removing sludge and gunk go with Syn. There is also the ablility to extend oil change intervals, but I did not do that.
One more thing is easier starts in colder weather with the 5W40 Vs 15W40 I noticed a big difference in starting ability when I went from dino Rotella 15W40 to synthetic 5W40.
Just some reasons...
Only reason why not to switch is the added cost, but I had figured it was cheaper than rebuilding the engine.
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"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
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