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I'm not saying you're not right, any derv out there can be tuned in variety of specs and provide a lot of joy on the road... My point is that driving habits should be a bit different once they are tuned in order to keep them safe from any malfunction - If oe spec engine fails when revved to high than why shouldn't a tuned one do so? Or if tuned engine delivers more power and torque at 3000 rpm then it used to deliver at over 4000 before it was tuned, then why not just utilizing this and not revving it's guts through the tailpipe? The main reliability issue of modern diesels is that they rev to high and still aren't up to the task except for some modern tdi's which are actually built for racing... Good thing they deliver so much power but they can't be bulletproof past the revs they were designed for decades ago. It's nice though that they can now provide satisfaction of overtaking some of the petrolheads on the motorway, but that's just about it. Those who punish them on the track, may be punished more severely on their way home. That's why no one can tune someone's derv and guarantee there won't be any side effects. Tuners are in many cases not to be blamed...
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