I vowed to never have a turbo,, then I found a VERY abused 3 year old JD 4105 at a dealer.
YES, it has a turbo,, but, I think my turbo is proof of reliability.
In 3 years, the PO put about 1,800 hours on the tractor,,
The dealer did sell it to me for "A SONG",,, so I had to buy it..
The first thing I did was spend over 2 hours washing manure off of the tractor.
In five years of use, mostly mowing, and other "yard work" type chores, I have put about 200 more hours on it.
The tractor still runs perfect.
This tractor weighs about 4,000 pounds,,
the ONLY way I even believe there is a turbo,,
is that there is no way a 1.5 liter diesel could pull this machine and mower without the turbo.
I mow a LOT of hills,, that is proof (to me) of the power.