I use it in by Kingpin's since they require more frequent oil changes and the cost for the Rotella is more in line with my budget. I mix the dino and synthetic together half and half and change the oil somewhere between 3 and 4k miles. I bought a box of 12 Wix filters so I don't need to chase one down when I get around to changing the oil.
On my XC I just changed to Valvoline dino motorcycle oil with Valvoline synthetic oil. Same thing; half and half. I could really tell the motor was running much smoother. The Valvoline dino mc oil is available at Walmart now. I found the synth at Autozone.
Cost with filter is about $25 for the Rotella and about $35 for Valvoline. If you are lucky enough to live near a Tractor Suppy (store name) you can find the T5 Rotella that is a synthetic blend already to go for about $20 a gallon.
I get the T5 at the local Tractor Supply. Can't beat the price for the gallon jugs. Use Napa gold 1356 (made by Wix) oil filters at around $6 each. And best of all, love that 5,000 mile oil change interval !!!