Bump.. I think this thread is important as we will stumble upon cars that have used unheated vegatable oil from time to time. Knowing that some problems can be undone at reasonable cost may impact our not walking away from an otherwise good car. Best of all they should be cheaper to purchase. I already aquired a beauty far cheaper that if it had it been running well or at all come to think about it. I suspected it might even require a new used engine originally. It will not.