7.3L life & tow
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While the 7.3L is a pretty tough motor, there is no magic aura that immunes them from dieing. The newest is now 10 years old and will require now more than just light maintenance. Valve cover gaskets, glow plugs, injectors, oil coolers, ect will just start needing replaced. And while prices of 7.3L parts have dropped dramatically, it still is gonna be pricy. Then on top of that everything and everything that has to do with the rest of the truck is normal maintenance.
I love workin' and having older trucks, it only is a little less money than a payment of a new truck.
An easier question to answer is what do you have/want to tow?
Adrianspeeder