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Originally Posted by R Leo
Your resident expert apparently doesn't know that cooking oil and biodiesel have significantly higher lubricity than straight diesel.
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The question is not whether you have higher lubricity. The question is whether you need it or not. It is just like gasoline octane. If you car can run on 87, there is no need for 93. MB injector pumps do not seem to be affected by ULSD so just because you have it doesn't mean a thing.
As to diesels becoming more popular, I doubt it will happen as more than a passing fad. How many people will carry disposable gloves to fuel up? That is what I do so I don't bring diesel into the car and stink it for the next two days.