It's a concern on all but the common-rail engines. The fuel lubes the pump on the 1st-gens, 89-93, and if it's not supplying enough fuel, burns up the pump.
You can run 2-stroke oil in your fuel to help lube the pump. I'd stay away from the additives that claim better mileage, they don't do much for you.
When I started running 2-stroke oil in my 90 I got another day of driving to work out of a tank of fuel, and it seems to be quieter now, too. I run about a quart per 50 gallons, that's 200:1.
If you're worried about it, change it. It can't hurt anything, and I don't think they are all that much coin.
I don't know about the second-gen 12 valves, you might be able to find some info at the diesel truck resource forums. You'll want the section on second-gen (94-02), 12 valve.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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