I'll try to explain my question better. I have a 1989 3.0L LWB Montero and I love it. I like the way it handles both off road and on paved roads, but I just have one nagging problem with it. How fast can I push "The Bus" and not hurt it. I believe my engine and transmission are in pretty good shape. Just 10000 miles I changed the timing belt, and water pump(because it was cheap and the engine was halfways dismantled), and flushed my transmission oil. The engine does not burn any oil.

I ask this question because I have traveled twice to Mexico (from El Paso, TX to as far down as Zacatecas, Mexico) and within the U.S. But because I don't know the limits of the Montero and I'm afraid to push it past 65 MPH. I'm just afraid that I'll hurt the engine and that it will leave me stranded in the middle of the desert (literally). That and I basically want to go faster, and I will continue to use the Montero for national and international road trips.

So my question is how fast (have you taken / can) the GenI 3.0L LWB travel at sustained highway speeds for trips greater than 200 miles? ( I understand that I have to take into account other factors such as aerodynamics of the car, road conditions, weather etc. etc. etc.)