You do indeed need to watch your oils with the DPF in mind. You want a zero ash oil, and most higher end 507 spec oils are low ash. Oil ash cannot be burnt off in the DPF and is the majority causitive agent that eventually clogs it.
I use Penrite Enviro, but anything decent and 507 spec will be fine.
I am a big fan of swapping out the oil early during run in, and always try to run in on mineral oils, but was unable to do so with the TDI due to the PD cam requirements for synthetic high shear oils. Penrite has a specific run in oil, used it to great effect on my last few cars, but no good for DPF cars!
It always comes down to peak combustion pressure, so you want lots of foot to the floor, but at lower speeds, higher loads so both revs and speed are kept within reason. No point revving the tits off it, nor flogging the brakes, tranny etc, so my belief is pick a hilly route, spend lots of time one gear too high, and lots of foot to the floor max efforts making the engine labour - peak engine pressures forcing the rings against the bore. Accelerating up a hill from 20-30kph in third as an example.
Worst thing to do is drive home from the dealer at a constant speed on the highway, you need to vary it as much as possible.
The law of diminishing returns applies, and the meat of the effect happens in the first few hundred kms, but a diesel isn't totally run in for many tens of thousands "apparently".
Google "motoman run in" if you want the method I swear by, and I've yet to have a bad result from following it.
Last edited by Greg Roles; 02-04-2012 at 09:10 PM.
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