This specifically relates to Volkswagen owners. VWoA only approves the use of B5 biodiesel in any of their clean diesel engines without voiding warranties. Do any VW owners out there use B20 and not have any engine issues? Propel Fuels backs their fuel 100% and say that the use of B20 in a VW clean diesel engine will not harm it in any way, shape, or form and if there is an engine failure as a result of using their fuels, they will pay for the cost of the repairs. Currently, VWoA is testing B20 blends of biodiesel in their clean diesel engines to approve it for use. I don't know what is taking them so long. Other auto manufacturers out there promote the use of B20 already. Has anyone had their VW warranty voided as a result of using the B20 blend?