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The max pressure on the sidewall is what the tire manufacturer says - Don't go above this number or the tire will be so stiff and inflexible that when you hit a pothole you'll damage the tire . . . . probably break a belt The door sticker is the vehicle manufacturer telling you that their number is safe, will give you decent gas mileage and a somewhat comfortable ride - Don't go below this number no matter what, because you could be compromising safety. Underinflated tires heat up and too much heat destroys the tire carcass - You can't see it happening, but this is what causes most blowouts . . . . a tire that was overheated 2 or 3 times in the past finally comes apart when you least expect it I use the door sticker number, plus 10 to 15% on all my vehicles Don

You could obsess over it with trying to decide on the perfect oil brand & formulation. Install a Fumoto valve, and then send in a sample for used oil analysis every 500 miles. Buy an $80 tool to cut open the $3 filter. Then definitively select the perfect oil, filter, and oil change interval based on hundreds of dollars worth of "science" and "research". I'm gritting my teeth. Conventional wisdom from decades past old technology. 3 months. 3,000 miles. They have brainwashed me. I am clawing my eyes out, as I await the oil change dash message. I've got 3 cases of filters and 100 quarts of oil stockpiled. Every day, I pick up my 15 mm socket, already attached to the ratchet handle, give it a few turns to hear the clicks, and feel the heft in my hand. Maybe I need to find a new girlfriend.