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The 5.8L is a good, long lasting motor.
The 5.4L is better and even longer lasting.
I had a 1994 and over 250,000 miles it never had a motor problem, but you could tell the motor was getting a little tired. It did need a lot of work on everything attached to the motor.... needed plugs and wires every 30k, thermostat by 150k, wire harness repair for be o2 sensors, a couple of sensors failed. Nothing show stopping but still needed plenty of TLC in the driveway.
My dad has the 5.4L. Needed plugs at 120k and 1 or 2 coils. And did one transmission fluid service after overheating the trans trying to back the boat of a steep driveway. That’s it. But it only has around 150k now.
I’d say the 5.4L is far less needy, but the 5.8L is a bit easier to DIY, except that now they’re all old enough plan on any bolt being stuck and breaking off.
FWIW, my V10 (which is the same as 5.4L with 2 extra cylinders) only needed spark plugs until needing some coils around 375k then a timing chain at 415k. Also had some injectors taken out by water in fuel around 350k. I did burn up a valve seat at 456k towing the trailer with a plugged fuel filter and a hot tune, and at that point I put in a reman because it was only slightly more than pulling the head for reconditioning. I scoped it to diagnose the compression issue, and honing still looked nearly new. I do the transmission fluid normally every 100k using the bucket flush method, with the pan coming off to replace the filter at 150k and 450k. Now has 495k.
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2000 E450 dually V10 wagon
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