I add mine thru the dipstick tube. I bought
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 this on Amazon & added a piece of clear tubing as an extension. Looks like I'm giving the engine an IV. It screws onto the bottle quart & gallon, after I invert the bottle I punch an air hole to make it flow quicker.
Also found a filter wrench that works on or off.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1