90-day PMI or "A" Inspection
The 90-day PMI is slightly more intrusive than a 45-day inspection, adding an oil change and an inspection of the undercarriage. When determining when this PMI should be done, a transit agency will generally have guidelines outlining the mileage or an elapsed number of days, whichever occurs first, to perform the inspection. In this case a typical mileage that would trigger this service could be something like 15,000 miles depending on the Original Equipment Manufacturer's (OEM) recommendation. These mileage intervals usually indicate a service interval that maintains the warranty coverage of a certain vehicle. Consult your OEM if you are unsure of your service intervals. A typical 90-day inspection might include:
- Lights: headlights, tail lights, turn signals, and interior lights.
- Tires: check for visible damage, and ensure proper inflation.
- Fluid leaks: check for any signs of oil, coolant, brake, or other fluid leaks.
- Brake performance: be alert to any changes in braking efficiency.
- Emergency equipment: first aid kit, fire extinguisher, and other emergency tools.
- Coolant level: top up if necessary.
- Oil level: check and top up if needed.
- Brake fluid level.
- Transmission fluid level.
- Power steering fluid level.
- Windshield washer fluid.
- Full inspection of braking system.
- Check belts for wear and tension.
- Inspect hoses for leaks or signs of wear.
- Detailed tire inspection: check tread depth and look for any damages.
- Battery terminals and connections.
- Air filter inspection/replacement.
- Check wheel alignment and balance.
- Lubricate chassis and all moving parts.
- Full engine diagnostic test.
- Transmission inspection and fluid replacement (as needed).
- Inspect suspension and shock absorbers.
- Replace windshield wiper blades.
- Inspect and clean HVAC system.