Odor issues

I'm new to the WVO scene and have a couple of questions. My sister's mercedes smells like stale oil/french fries... Is this common for most wvo conversions? I haul alot of goods and can't do it if my truck smells this way. Also, is the GMC 2500 a good conversion vehicle?? are fuel filters/injectors a frequent problem or will I be running smooth on most of my Trips??? Thanks for any help you can give. Wolakota7@hotmail.com

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