There are countless threads on this debate, but far too many have bent rods, soley in the 350 displacement. Then they wear the cylinder walls and loose compression. 300's do not seem to suffer this malady. Certainly an engineering error.

Seems like the most reliable are the non-turbo motors, but those are the least fun to drive. Really hard to go wrong with an older MB.

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raMBow

1999 E300DT Obsydian Black Metallic, Heated Full Leather Parchment options, E2, K2, 136,000+, best 36.5 mpg - GP's 12-04 & 11-12 Zero Stuck
2010 Honda Odyssey - The BrideMobile - best 26.5
(2) 2005 Honday Accord- (1 -Corporate 1 - Personal) - 110,000 4-cyl 30mpg
2000 VW Golf GLS TDI, Upsolute Chip (sold to Brother, now 300+k on it) 48.5 mpg like clock work
1987 Honda CRX HF - Sold 87,000 always over 50 mpg Max 67 mpg