I have reviewed the various posts regarding gear oil in the final drive and while it is all good information, the posts drift from the main subject and become confusing. I am ready to do a final drive fluid change and wonder if the redline heavy shockproof gear oil is appropriate for a 2012 AN650. I am confused due to the info saying it offers the shear protection of a 75W250 oil with the viscosity of a 75W90 oil. Has anyone used the oil in their final drive? Does it work? Any drawbacks? Or should I just stay with a 75W90 oil? Thanks for the info....