Hi i'm new here and i have a Loncin 250cc motor and i don't know how to change or check the engine oil,how much oil should be in there and how can i check the gearbox oil and where is the filler plug, how much oil should be in there one other thing i'm curious to know about i have a little hole on my gearbox cover and i think all the gearbox oil leaked out and i need to know what type of oil and if i can use havoline automatic transmission fluid and how much i need Thanks