The vehicle is an '87 300SDL. The previous owner told me that the trap oxidizer was removed in favor of an oxidation catalyst. What is the difference between the two?

I have started using Redline Diesel Fuel Catalyst but started wondering if this would be harmful to the oxidation catalyst. I have read on previous posts that the DFC was harmful to the trap oxidizer but what about the new oxidation catalyst?

Herb
'87 300SDL
'82 240D