Use OEM transmission fluid...or all fluids really.
In this video, This Old House general contractor Tom Silva shares tips for keeping a roof free of moss and mold
When parking on a hill, apply emergency brake before shifting to park. This puts the force that prevents the car from rolling down the hill on the brake and not the transmission.
Recent Optima batteries are made in Mexico, not U.S., and quality dropped (while price increased). Avoid Optima batteries.
Ethanol is common additive, but should not be more than 10% or can damage the engine. You can buy a device to measure ethanol content.
Check your car model for recalls.
Boslla LED Headlight Bulbs are spendy but look very effective and adjust to visibility conditions. Very cool. https://amzn.to/2UQTjAZ
Silicon lubricant for window rubber and Nu Finish polish in place of RainX for window for beading water.
Advises against using quick struts. Not made well.
Scotty recommends this product for keeping rubber parts on car supple.