Is it a modern diesel with DPF and SCR? The smell from the exhaust of my 2021 6.7 liter cummins diesel motorhome is actually almost undetectable to me while my

Is it a modern diesel with DPF and SCR? The smell from the exhaust of my 2021 6.7 liter cummins diesel motorhome is actually almost undetectable to me while my 2016 V10 gas motorhome had a very noticeable smell. Perhaps the diesel is not ULSD https://en.wikipedia.org/wiki/Ultra-low-sulfur_diesel https://en.wikipedia.org/wiki/Ultra-low-sulfur_diesel