The Toyota 4Runner is one of the most durable SUVs ever built — a body-on-frame workhorse that routinely exceeds 300,000 miles with proper care. In Oklahoma, where 4Runners serve both as weekend trail rigs and daily drivers on Coweta’s rural roads, maintaining a 4Runner correctly is an investment that pays for itself many times over. This guide covers what the 4Runner needs to reach high mileage, what issues to watch for by generation, and how Oklahoma’s conditions affect your service schedule.
4Runner Maintenance Schedule
Every 5,000 Miles / 6 Months
- Engine oil and filter (5W-30 for older models; 0W-20 for 2010+ 4.0L V6)
- Tire rotation
- Visual inspection of undercarriage, tires, lights, fluid levels
Every 30,000 Miles / 2 Years
- Brake fluid replacement
- Front and rear differential fluid (critical — most owners skip this)
- Transfer case fluid (4WD models)
- Air filter and cabin filter replacement
Every 60,000 Miles
- Spark plug replacement (iridium plugs on 4.0L V6; conventional on older V6)
- Coolant flush and refill
- Automatic transmission fluid service
- Serpentine belt inspection
4Runner-Specific Issues by Generation
4th Gen (2003–2009) — 4.0L V6 1GR-FE and 4.7L V8 2UZ-FE: The 4.7L V8 uses a timing belt — replacement at 90,000 miles is mandatory. The 4.0L V6 is a timing chain engine with excellent longevity. Both engines are relatively trouble-free with regular oil changes. Watch for: rear differential leak at high mileage (the rear diff pinion seal is a common wear item), and front lower ball joint wear by 100,000–140,000 miles.
5th Gen (2010–present) — 4.0L V6 1GR-FE: Toyota kept the same proven 4.0L engine through the 5th generation, which is a testament to the engine’s durability. At high mileage (150,000+), watch for: valve cover gasket seepage, oxygen sensor codes (P0135, P0155), and suspension component wear (sway bar bushings and links wear consistently at 100,000–120,000 miles in Oklahoma road conditions).
Transmission fluid hesitation issue (2010–2018 automatics): Some 5th-gen 4Runners with the A750F automatic transmission exhibit a notable hesitation when decelerating and then accelerating from low speed. Toyota issued a revised transmission fluid spec (ATF WS) that resolves this in most cases. If you’ve never had the transmission fluid changed, this is worth doing.
Oklahoma-specific: undercarriage inspection: 4Runners driven on Oklahoma’s red clay trails and gravel roads should have undercarriage inspections annually. Caked red clay can accumulate around the exhaust, differential vents, and brake components. Have it cleaned and inspected to prevent hidden rust and restricted venting.
Norm’s Auto Clinic services Toyota 4Runners from all generations. We understand the specific maintenance needs of both pavement drivers and off-road users. Call us at (918) 279-8100 or visit 19 N. Broadway, Coweta, OK 74429.