Diesel Particulate Filter DPF

[GrantA]

Originally Posted by Tatsfield

Are there any diesel engined cars being made today which do not have some sort of DPF system?

PSA chose the cerene additive system as it works independently from the car's fuelling system but Volvo seem to use a system which counter injects diesel fuel to initiate combustion in the filter chamber for regeneration. Apparently the downside of this is that excess fuel gets washed past the piston compression rings and dilutes the engine lubricating oil, which is why Volvo changed the "full" engine oil level to be only 75% of the capacity to allow for the washed back diesel to sit in the sump without over filling the oil and causing over pressuring problems. I think that's why the Volvo salesman don't want to talk about the DPF! They get very simple/stupid statement repetitive if you do try to discuss diesel dilution of the engine oil.

In answer to your first question Google search is your friend see here: http://www.dpfproblems.net/cars-without-a-dpf/

There have been several Threads on here about the problems regeneration causes with rising oil levels, a lot of them were written before you join the Forum. If you do a Google search you will find some sorry tales of woe about "regeneration" including a 4 year old Vauxhall Astra 1.9 cdti engine which blew up at 36k miles because the regeneration kept failing until the DPF became so blocked when the regeneration did eventually happen there was so much fuel put into the sump the engine wrote itself off.

I have done a bit of research on line and it would appear that the "Super Tech Outboard 2-cycle TC-W3 engine oil" you mentioned in your previous Post is semi or part synthetic oil specifically recommended for water cooled engines i.e. marine outboard engines. It also appears to be thinner than "normal" 2 stroke oils so when used in air cooled engines that run at a higher temperature it can cause premature wear and scuffing on the piston.

But we are talking about using 2 stroke oil in a diesel engine, if you are going to put 2 stroke oil into your diesel fuel tank then the advice is only to use 2 stroke mineral oil and to avoid any of the synthetic or semi-synthetic oils. As I said before some of the newer diesel engine have injectors that will clog up if 2 stroke oil is used, if you are in any doubt then don't use it.