Most of us own Pajeros 2.5 turbo diesel. Not a big difference. My truck is also gen.1, 1990. It is ok on highway, making 25 MPG. I drive easy - 130 km/hour speed, didn't try faster - ( I have same speeding tickets, it is expensive!) Good engine response. 90km/hour - 2000rpm, 100km/h - 2200 rpm, 130km/h - 2800rpm. Driving is comfortable. I can't tell much about off-road performance, but thiese trucks are world famous of-roads winners, so you can rellay on it. I have an owner manual, if you need something specific - I can look for you. If the truck doesn' smok, no leaks - it should be ok.