I bought 4 quarts of Castrol 10-40 regular dino motorcycle oil on special for $ 2 a quart. I currently have 5000 km on my synthetic oil and will be putting my bike away for the season. My plan is to change the oil and put the regular fresh dino oil in, ride a bit with it in spring, then do a proper synthetic oil change with filter. You guys think that's ok? Can these bikes run regular oil?