The white jug 15w 40 for diesels is what I use. You have to look on the codes on the back and understand them to know that it is safe for our bikes. I have no plans to go back to anything else as far as oil goes and you just can't beat the price. But cheap is not why I use it in my bike and my big rig. I have seen how clean my engine is on the inside and thats over 300,000 since the last rebuild. If it will hold up under the conditions my truck goes through @10,000 mile oil changes it will certainly hold up for 3500 to 4000 mile oil changes in my bike.
My clutch whine has been noticeably quieter since using it.