Greetings All. Running a 2001 ALH Golf 5 Speed. I live in Northern Ohio. My car has just under 100k miles on it. I am not the original owner so I don't know exactly what types of fuel have been used over the life of the car. Since I have had the car I have used mostly BP brand ULSD with no issue. A few months ago I started running Stanadyne as a fuel additive (just the performance formula) seemed to run a little smoother. I was interested in biodiesel and found a source for B20 at the other end of my commute. I am planning on changing the fuel filter right at 100k miles, so I thought I would run a tank or two of B20 to clean things out and then change the filter. Here are my questions. The car runs really good on the B20 blend I have in the tank now. Nice and smooth, easy starts, maybe even more power, feels as good as its ever felt. Are there any modifications I need to make to the car in order to run B20 on a more permanent basis?? I read something about changing fuel lines? Can someone confirm that for me. Will B20 work in my cold weather application (it can get pretty cold in Ohio in Jan. and Feb.)?? If I continue to add the Stanadyne will that make the B20 less likely gel the same way it would regular petro diesel? Or is it not necessary to add the Stanadyne to biodiesel? Do the drawbacks of changing back and forth between bio and petro out way the benefits of using bio in the first place?? (If I take a road trip and can't get Bio I would be forced to switch back to petro diesel) Do I need to worry about injection pump leaks with B20/petro back and forth?? I would love to see this car go the distance. I am very impressed with it from top to bottom and am looking to be a very diligent owner. Thanks for your input.