Guide
10 things new car owners forget — and what each one costs later
The expensive failures almost always start as something small that nobody looked at: tire pressure, a coolant level, a cabin filter, the spare. Here are the ten that come up most, what happens if they are left, and which ones you can check yourself in a driveway in five minutes.
Updated 2026-08-22 · Frank's Mobile Mechanic 24/7
The five you can check yourself, tonight
1. TIRE PRESSURE. The single highest-value five minutes in car ownership. Under-inflated tires wear at the edges, cost fuel and run hot, and heat is what turns a worn tire into a blowout. The correct number is on the sticker in the driver's door jamb, not on the tire wall.
2. OIL LEVEL. Not just the change interval — the level between changes. Engines burn a little oil as they age and a low level is what turns normal wear into a bearing failure. Check it cold, on level ground.
3. COOLANT LEVEL. Look at the overflow bottle when the engine is cold. If it keeps dropping, something is leaking, and a cooling system that runs low in this climate does not stay a small problem.
4. THE SPARE AND THE JACK. Most people discover the spare is flat and the jack is missing on the night they need them. Check the pressure in the spare and confirm the tools are actually in the car.
5. LIGHTS. Walk around the car with the lights on and have someone press the brake. A burnt-out brake light is invisible from the driver's seat and is one of the most common reasons people get pulled over.
The three that are easy to forget and expensive to ignore
6. BRAKE FLUID. It absorbs water over time, which lowers its boiling point — exactly the wrong property on a long descent. It is a time-based service, not a mileage one, and it is skipped constantly.
7. THE CABIN AIR FILTER. Not safety-critical, but it is why the A/C smells and why the fan seems weak. It is also one of the least expensive parts on the car and often reachable behind the glovebox.
8. THE 12-VOLT BATTERY TERMINALS. Corrosion at the terminal mimics a dead battery and a dying starter. A no-start that turns out to be a furry terminal is one of the most common calls there is.
The two nobody thinks about until it is too late
9. THE OWNER'S MANUAL SERVICE SCHEDULE. Every car has one and almost nobody reads it. It tells you which services are time-based rather than mileage-based, which matters enormously for a car that does short trips.
10. WHERE THE CAR ACTUALLY LIVES. A car parked outside in the Valley sun ages differently from one in a garage — the paint, the dash, the wipers, the tires and the battery all take it. If your car sleeps outside, everything on this list moves up the priority order.
If something on the list is already wrong
Most of these are checks, not repairs. But if the check turns up a problem — the coolant is low again, a terminal is corroded, the brake pedal feels soft — that is a real repair and the car does not need to go anywhere for most of them.
Text the year, make and model and what you found to (323) 413-4378. You get a straight answer about whether it is urgent, and a written estimate before anyone starts.
