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ZF developed the steel pan for Land Rover because of the narrow space from a chassis cross member running underneath the pan. It is not required for BMW's and decreases the oil capacity by 1 litre. Having less fluid will require more frequent OIC as the oil will enter the high temperature strategy and degrade as well as contain more suspended particles and contribute to wear.
Compression ignition engines use a two way DOC to reduce carbon (soot) as the carbon particles have a layer of hydrocarbon. The OEM DPF has a DOC prior to the particulate filter so the soot that is not handled by the DOC and becomes obstructed in the particulate filter and requires a regen. It is the particulate filter which becomes obstructed and requires a regen not the DOC.
In a spark ignition engine a three way catalytic converter handles nitrogen oxides and cannot be compared with a two way DOC.
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