It's kind of an apples and oranges comparison for either, if designed properly. Often, when a company takes an existing NA engine, and puts a turbo on it, they beef it up along the way. Lower compression pistons - that might be a anodized and use plasma Keystone rings, bigger piston pins, piston-skirt oil cooling, stronger rods, bigger cooling system, etc. If done right, one can last just as long a the other. Turbo version does more work and is built to endure it. In fact, sometimes the turbo versions last longer because they don't suffer from being overheated and overfueled, and lugged, resulting in cracked heads. That is very common in some non-turbo automtotive diesels.
Now, is a NA cheaper? Well yeah, usually since it costs less to build. But many times a smaller turbo engine takes the place of a larger NA engine - so that cuts down somewhat on the price difference.
Less things to wrong? One less turbo on the NA, that's all (for many systems), and turbos can last a very long time.
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Today's Featured Article - Buying your first tractor: The People You Buy From - by Chris Pratt. If you are a first-time buyer, chances are that you are likely to take the word of the seller on things. This is where the problems start... You have reviewed your implement needs and determined the size of machine that will fit the bill and even made a list of the most desirable models. You checked on the availability of a 3-point hitch for the machines on the list and advertised in your local classified paper with so
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