Routine Maintenance

DIY Headlight Maintenance: Restore Foggy Lenses and Replace Bulbs

Dim, yellow headlights are one of those slow problems that sneaks up on you. One night you are cruising along just fine, and the next you are squinting into a gray tunnel wondering if your brights are secretly just candles. The good news: most “my headlights are weak” complaints come down to two...

30k, 60k, and 90k-Mile DIY Maintenance Checklist

If you want your car to hit 200,000 miles without draining your wallet, the 30k, 60k, and 90k-mile service intervals are where the magic happens. Not because they are glamorous, but because they are the point where little wear items turn into expensive problems if you ignore them. I used to see it...

Check Your Serpentine Belt and Radiator Hoses

If I could pick two “cheap insurance” checks for a beginner, it would be these: your serpentine belt and your radiator hoses. They’re both rubber. They both live in a hot, grimy engine bay. And when they fail, they rarely do it at a convenient time. The good news is you do not need a lift, fancy...

Failing Spark Plugs: Symptoms and Replacement Steps

If your car has started idling like it has a little stage fright or your fuel economy has quietly taken a nosedive, spark plugs deserve a hard look. They are small, cheap (most of the time), and they do one job that matters a lot: light the air-fuel mixture on time, every time. I have seen plenty...

Engine vs. Cabin Air Filters

I have watched people get quoted real money for a job that takes less time than your coffee order. Engine and cabin air filters are two of the easiest maintenance items on most cars, but they get mixed up constantly. One protects your engine. The other protects your lungs. Both matter, and both are...

6 Car Fluids You Should Check Regularly

I grew up holding the flashlight for my grandpa, and the first lesson I learned was this: cars rarely fail out of nowhere. They give you little hints first. Low fluid is one of the clearest hints, and it is also one of the easiest things you can stay ahead of at home. In many vehicles, you can...

Change Your Engine Oil and Filter at Home

I grew up holding a flashlight for my granddad while he changed oil on anything that had an engine and a leak. Later, I spent a decade in repair shops watching people get charged real money for a job that many drivers can do in a driveway with a little patience and the right safety habits. This...

About Marcus Thorne

Welcome to Oil & Wrench . I’m Marcus Thorne , a former ASE-certified mechanic, lifelong automotive enthusiast, and the guy who hates watching good people get talked into repairs they do not need. If you’ve ever stared at a dashboard warning light like it’s a personal insult, you’re in the right...