Because doing your own basic maintenance is an outstanding way to identify issues that you might miss otherwise? As an example, I swap my own winter and summer

Because doing your own basic maintenance is an outstanding way to identify issues that you might miss otherwise? As an example, I swap my own winter and summer tires (mounted on separate sets for wheels; I have my limits) because it gives me a twice yearly opportunity to asses the condition of the brakes and suspension components while I'm mucking around with the wheels off. Keeping your finger on the pulse of a machine by looking after it means you spot problems before they become disasters and inform how you operate it to make the most of its capabilities and avoid its weaknesses. Capt. Malcolm Reynolds: Love. You can learn all the math in the 'Verse, but you take a boat in the air that you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps her in the air when she oughta fall down, tells you she's hurtin' 'fore she keens. Makes her a home.