iv recently brought my daugther a tiggershark 770r 98 and getting it ready for test this weekend on the water so i want to double check everything is right for saftey , and make sure got enough oil etc but i can find a manual for it ( so maybe someone out there may know of a site to buy 1 , thanks in return failing that question on crankcase oil what grade is it, how offten should this need checking?