Would a DPF flush clean lead to possible contamination of the engine oil which might necessitate an oil change?
Vijitha, UK
I doubt that a ‘DPF flush clean’ would cause engine oil contamination. As far as I’m aware, most of these types of fluid treatments are applied through a pressure sensor port close to the DPF. This is downstream of the turbocharger, which would be the only part of the exhaust system where contact with engine oil could take place. Therefore I wouldn’t expect engine oil contamination to be possible.
However, it may be possible that the engine oil could become contaminated as a result of DPF blocking problems. Some vehicles use ‘active regeneration’ to combat soot build up, this involves a post-combustion fuel injection into the exhaust stream. This acts as a sort of ‘lighter fluid’ to initiate soot burn off in the DPF. Depending on the set up, some vehicles simply inject fuel on the exhaust stroke of the engine. If this is happening very regularly due to DPF blocking problems, then there is a possibility that the oil may become contaminated by fuel.
So it could be that the circumstances leading to someone using a DPF flush clean may necessitate an oil change.