Posted Today, 12:24 PM #1 so i have (won in a fishing competition) 4 litres of Valvoline 4 stroke outboard marine engine oil, 10-40w.My recently bought 2012 wr450f( needs an oil change and i would greatly prefer to use this to avoid buying more oil. It is the correct weight and the only thing i am worried about is that it is marine oil. What i am wondering is if it would be safe to use? what difference is it to normal, non-marine oil? the only thing i can think of is that it has more anti corrosive properties in it. correct me if i am wrong as haven't been into bike for long. cheers!