06:47 09-05-2026

What the shop won't tell you: the simple checks that save real money

Mechanic and YouTuber Scotty Kilmer lists the basic checks that catch trouble before it turns into a costly repair: battery, alternator, belts, oil, tires and ATF.

Car maintenance is getting more expensive: prices are rising for parts, fuel and shop labor. That is why veteran mechanic and popular auto blogger Scotty Kilmer urges drivers not to leave their car entirely at the mercy of someone else’s diagnosis, but to at least understand the basics.

First on the list — the battery. If it suddenly gives up, the car simply won’t start. You can test it with an inexpensive battery tester, or for free at most auto parts stores, which often run the check at no charge. If the reading shows a low state of charge or drops into the red zone, don’t wait for the morning when the car refuses to wake up.

Next comes the alternator. It charges the battery while the engine runs, and replacing it can cost serious money. You need a multimeter for the check: with the engine off, a fully charged battery normally reads around 12.6 V; once the engine is running, expect roughly 13.6 V or higher. If the voltage sags when you switch on a load — the air conditioner and the stereo, for example — the alternator may be heading for trouble.

Belts and hoses don’t last forever either. A drive belt typically lasts about 5–7 years, but cracks, heavy wear or loose tension are reason enough to replace it sooner. The belt itself is cheap; a snapped one can cause far nastier damage. Sometimes a flashlight under the hood saves you a major repair bill.

Kilmer also advises changing engine oil every 5,000 miles — roughly every 8,000 km. It is one of the simplest jobs that genuinely extends engine life. You can buy the oil, filter and gasket as a kit; the key is matching the viscosity and specification listed in the owner’s manual.

Tires are a topic of their own. Check pressures at least every two weeks, especially when temperatures swing. Over- or underinflated tires hurt fuel economy, accelerate wear and can spoil handling. Wheel alignment is best done at a shop, and don’t skimp on new rubber: a blowout at speed costs far more than any set of tires.

For automatic transmissions, Kilmer recommends changing the fluid every 60,000–70,000 km, even if the manufacturer talks about longer intervals or «lifetime» fluid. The job is hard to do at home — better to leave it to a specialist.

The point is simple: a car’s reliability isn’t about the badge alone. Even a good car can be driven into an expensive repair if you push it to the limit. Basic checks give a driver the one thing that matters — a chance to catch the problem before the service invoice does.