Which vehicle, are they non turbo? I could definitely see where that would be the case with a vehicle that was somewhat worn out. The other side of it is the process and the oil used. I made that last batch that we ran at 100% from soy bean oil that was unrefined in any way (straight from the crusher). It had a far different finished smell than the WVO produced bio. And, never has any of the bio, WVO or SVO produced, smelled like fries.
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