I thought about chip-tuning my E300's but have heard so many bad experiences of reliability with people tuning their cars in general. What can go wrong and what's the chance? Don't think I'd ever take a chance on knocking the reliability off my cars. They startup every time i need them to without a hiccup.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k