At 100,000 miles, your 2015 Toyota Sienna hits a major maintenance milestone. The main service at this point is replacing your engine coolant. Beyond that, you'll continue following the same maintenance pattern you've been doing.
Key 100,000 Mile Service
Coolant replacement is the primary service due at 100,000 miles. This keeps your engine running cool and prevents rust inside your cooling system.
Ongoing Maintenance After 100,000 Miles
Keep up with these regular services based on your mileage:
| Service | Frequency |
|---|---|
| Oil and oil filter change | Every 10,000 miles |
| Tire rotation | Every 5,000 to 7,500 miles |
| Spark plug replacement | Every 60,000 miles |
| Engine air filter replacement | Every 30,000 miles |
| Inspect brake pads and rotors | Every 15,000 miles |
What Else to Check
At each service appointment, have your technician inspect:
- All fluid levels (transmission, brake, steering)
- Brake lines and hoses for cracks or leaks
- Drive belts and serpentine belt for wear
- Wiper blades
- Transmission condition
These inspections catch small problems before they become expensive repairs.
Plan Ahead for Future Services
If you haven't replaced your spark plugs since 60,000 miles, you'll need new ones soon. Drive belts typically need replacement between 60,000 and 100,000 miles, so have yours inspected at your next service.
Tracking your maintenance schedule helps your Sienna run reliably for years. Keep records of every service you complete, including dates and mileage. This protects your resale value and helps you spot maintenance patterns.