I have been using the Yamalube 10W-30. Due to the temperatures in Dubai I am going to change my oil type to 15W-50. The only oil I can find is the Mobil 1 Racing 4T bike oil. Has anyone used this oil before? Any feedback. Furthermore, once I change over I was planning to change the oil and filter, warm the engine, ride for about 15 minutes and do another oil and filter change as a flush so that I finally have as little mixing of the 2 different oils as possible. How does that sound or should I not bother with the second change.