Really? I always thought that the 4L was a Mazda engine and the 3L was a Ford engine. Either way, I'd stay away from the 3L. They're always prime candidates for a valve job at only 100K miles.
And to be more specific I'd prefer the older OHV 4L to the SOHC 4L. They seem to be less problematic from what I've seen on DezertRangers. Unless I was looking to build on it.
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