[userbinator]

or calibration changes cause engine to to over-heat and burn up and generally the company is held responsible for it

This happens not-too-infrequently in the car modding/tuning world --- the former, that is; to my knowledge no one has blamed the original manufacturer, much less successfully sued, after him/herself modding the ECU of a car and blowing up the engine.

Don't forget that a lot of other safety-critical components of cars (e.g. brakes, tires, etc.) have aftermarket replacements --- many of which actually perform better than stock.

If this "safety" attitude was prevalent since the beginning, we'd have cars that can only use approved fuel, no aftermarket parts would exist at all (their manufacturers being sued out of existence), and it'd be illegal to drive them on roads not approved by the manufacturer.

I will resist the urge to post that famous Benjamin Franklin quote this time.

[emcrazyone]

Tractors & Combines are way more expensive than cars so it's not a fair comparison. You can't use a cherry picker to replace a tractor engine... At least the large kind.

Tractors and Combines use DEF and I hear reports of people defeating it. Our software has checks to look for such activity.

[SteveGerencser]

We already have tractors that are required to use only factory oil. The use of any other oil voids the powertrain warranty.

[mrguyorama]

Voiding the warranty is perfectly fine. I don't think it's the burden of Deere to support aftermarket modifications.

The current situation however is more like the tractor bricking itself and never working again if you attempt to open the oil reservoir yourself, without the per-requisite authenticated repairman keys