I changed my oil last week and changed from synthetic to Blue Marble 10w-40 and I am amazed I am getting 6 more mpg on my GL1800 and more power, revs quicker, more power. I told one of my buddies about it and he put it in his Ultra Classic in the crankcase. He notice the power improvement with in a couple hundred miles. He has had it in a week or so now and stopped over with the wife on the back and says he notices a big difference with her on the back.
The company has been around for 11 years but only made 2 cycle oil until not long ago. This too has the patented technology in it just as the famous 2 cycle racing oil, They claim it is biodegradable and smoke free. I found it online at Blue Marble (http://bluemarblestore.com) I will never go back to the Mobile 1 or Royal Purple I have previously used for years...

Rick