You need to multiply 300m by 100cm since there are 100cm in a meter. You should be able to solve that mentally.
300m
30,000 cm
This WEBSITE has the answers as well as pictures and a step by step: http://theswampbbs.com/300m/plugchange/default.html
Oil change is due.
You should change the oil every 3 months of 3000 miles.
4.5 quarts
Carefully remove the lens then bulb
5 to 5.5 quarts
300m
300m is 0.3 km.
Change your input speed sensor. They are cheap at Napa -- and easy to change
as long as you keep with the maintenance, change the oil every 3k and change the tranny fluid every 30K you should fine