Have a 2008 Chevrolet 2500 diesel with 120,000.miles. This has excellent maintenance. Most people think it is new. We have just started getting a smell of crayons. Only happens every once in a while...
Yup Rosmella has an odor for sure. But IMO it smells like oil. I used the stuff once and it was annoying. Then a buddy had my truck for a while, we swapped trucks and he had the oil changed, called me saying he thinks it's leaking or burning oil. It was the Rotella smella.