In my experience (we have two VW diesels, and two early 1980s Mecedes diesel) is: 1) In a VW engine, straight (or anything more than 10 or 20 percent) veggie oil causes coking/carbon build up. Not recommended. 2) In a Mercedes engines, there still is coking and carbon build-up, but it's not as bad as a VW engine. My recommendation: don't use Veggie Oil. Use/Make biodiesel. Both the VWs and the Mercedes' engines are much cleaner after using Biodiesel. And, I do experience a little less mileage with veggie oil or Biodiesel. There is simply less energy in a gallon. Jon > On the straight "previously used" vegetable oil, the oil was filtered, > but otherwise not tampered with. The Mercedes diesel got 30 mpg, not 33 > mpg. The 33mpg was on regular diesel fuel. Even so, that is pretty > impressive. In a pinch, you could go into the grocery store and buy > enough vegetable oil to get to where you wanted to go. |
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