These engines have aluminum heads that can warp if the engine is overheated â€“ check for that. Otherwise they are excellent engines. You donâ€™t want excessive smoke, hard starting, overheating, heavy shaking, oil pressure should be good, and no â€œnailing.â€? If you hear a sound that sounds like a large nail being hammered into a block of oak, walk away â€“ youâ€™ll know it when you hear it. The transmission should be quiet and the steering track straight. Check for rust. Check the undercarriage on a lift. Are there service records? You may not find a lot of web info on the diesels because they were only imported to the US. Good luck and keep us posted.