I recently switched my 08 FZ1 over to synthetic. Purchased a Mobil 1 filter and was going to go with the Mobil 1 4T but after doing some reading and research on oil, I decided to use Rotella T6. It was only $20 a gallon (4 quarts) at my WalM here in Ohio and I'll be changing oil yearly, so no worries about oil breakdown for me. They didnt carry the 4T at my WalM either. If I road more than 3500 miles a year on the bike, I'd probably go to an autoparts store and pay more for the Mobil 1 4T, but I only average about 3K per year of riding so the Rotella T6 will do just fine and save some coin in my pocket.