How to maintain your car without getting ripped off? What needs to be replaced and what doesn't?

Hey guys, how do you all maintain your cars after driving in the sand?

How to maintain your car after off-roading on sand

How to maintain a 2006 car with 170,000 kilometers? What grade of engine oil is suitable?

Actually, I want to meet some experts in car modifications. I want to modify a Suzuki Swift, but I'm not familiar with the parts and I'm afraid of getting ripped off. Is there anyone who knows about this and can help? [crying]

Are repairs for Hongqi cars expensive or a rip-off?

Has your engine fuel line been replaced? Mine gave a warning today and needs to be replaced.

Fellow car enthusiasts, how often do you replace your solenoid valves? Mine needs replacing every year, and this year I've already replaced two.

How to maintain your car without getting ripped off? What needs to be replaced and what doesn't?

The classic version doesn't even have front ventilation; this feels like a rip-off.

The battery couldn't start the car after 3.5 years and needed replacement, even though the auto start-stop feature was mostly off. Fellow car enthusiasts, when did you replace your battery for the first time?