These tips are not for engine maintenance, but rather things we need to do on a regular basis.
Here's an odd one which I doubt I will try.
On those days when we want to lock or unlock our car and we're too far away or lost track of our car in a parking lot for the key fob to work, try this. I dare you. "Your body’s fluids can extend the wireless signal from your key fob to the parked car. Just put your car key fob under your chin, open your mouth, and push the button on your keychain." Or, have a bottle of water with you, hold it over your head with the key fob next to it and Voila!
You'd need to be a contortionist to succeed but the article also gives the science behind this explained in a video by an amusing British man.
Other tips at the link and include the use of toothpaste, how to cool down a hot car quickly in summer, best way to defrost, how to repair windshield cracks and more.