I make bio from WVO. It takes no outside heat at all in Florida. All it takes is lye, methanol, and waste oil. Also you can run it at any mixture 1% to 100% with no modification to the car at all. MB has all steel fuel lines except for what you see under the hood and a short section on some cars at the tank. At 100k miles you may want to inspect the rubber but otherwise no problem.
There is also someone on this forum in the UK who uses SVO with no preheat and has no problems. Cost to manufacture from WVO is about 60 cents US per gallon. If you can get paid to haul off the WVO which some people do you can make a profit by burning bio. Road taxes not included of course, and we always pay those