New Owner Checklist

Contributions welcome — this is a wiki. Anyone can edit this post. Add model-specific intervals, known rust spots, and gotchas with the year/model noted. Verify any spec against a reliable source for the exact vehicle before trusting it — these trucks span many years and markets.

Just picked up an Isuzu? Congratulations. Before you trust it on a long drive or judge what it’s worth, work through this list. The point is simple: find out what you actually bought, get it onto a known baseline, and don’t get surprised by something a 30-minute inspection would have caught.

1. Fluids and the basics (do these first)

• Engine oil — level and condition. If history is unknown, just change oil and filter and start your own clock.
• Coolant — level, color/condition, and strength. Inspect hoses for soft/bulging spots and the radiator for crust and leaks.
• Transmission fluid — level and condition (manual gear oil or ATF as applicable).
• Transfer case and differential(s) — check/level the gear oil; on a 4x4 there’s more than one.
• Brake fluid — level and condition; dark fluid is overdue.
• Power steering fluid — level and condition.
• Fuel filter / water separator (diesel) — service it and drain any water. Cheap insurance.
• Air filter — pull it and look. A filthy one tells you about prior care.
• Battery and terminals — clean, tight, and holding charge.

When in doubt about history, just refresh the wear items now. A clean baseline makes every future diagnosis easier.

2. Timing belt or chain

• Find out whether your specific engine uses a timing belt or a timing chain.
• If it’s a belt: it’s an interval/age-based service item and a belt failure can wreck the engine on an interference design. If you have no proof it was done, assume it’s due and budget to do it (belt + tensioner + idlers, and the water pump while you’re in there).
• If it’s a chain: listen for rattle on cold start (worn guides/tensioner) and keep up on oil changes, which is what keeps a chain healthy.
• Verify the correct interval for your exact engine and year from a reliable source — don’t guess. Post the question with the engine tag if you’re not sure.

3. Common rust spots

Rust is what kills these trucks more than anything mechanical. Get it on a lift or crawl under it.

• Frame rails — especially near suspension mounts, the rear shackles, and anywhere mud packs in. Poke suspicious areas.
• Rocker panels and lower doors.
• Wheel arches and fender lips.
• Floor pans — pull the carpet/mats and check, including around seatbelt mounts.
• Body mounts and bed/cargo area mounts.
• Brake and fuel lines — surface rust is fine; flaking/pitted lines are a safety job.
• Suspension mounting points and the steering box mount.

Surface rust is normal. Structural rust (frame, mounts, anything that holds suspension or seatbelts) is a stop-and-evaluate finding.

4. Records and documentation

• Get whatever service records the previous owner has and read them.
• Note the VIN, engine code, and build/market so you order the right parts.
• Confirm title, registration, and any recall/inspection history are in order.
• Start your own log from day one — date, mileage, and what you did. Future-you (and the next owner) will thank you.

5. Where to start on the forum

• Read How to Use Isuzu Nation so you know how categories and tags work.
• Search your symptoms and your model before posting — odds are it’s covered.
• Post an intro in Introductions, including year, engine, and what you’re working with (tag your model).
• Keeping or building it? Start a build thread and tag it build-log.
• When you fix something, mark the thread solved so the next new owner finds the answer faster.

Welcome to the marque. These trucks reward the owner who does the boring maintenance — get the baseline sorted and it’ll go a long way.