I mostly use Sainsbugs and Tesco and sometimes Asda (very rare) and even rarer BP but as it's in the village and sometimes it's about the same price, and if im low and just going up the road with my drone, then cheaper to get BP than to go , but its mostly (90%) at Tesco on my weekly shop and 9.999 at Sainsbugs, the remainder split with the rest. I am diesel and I never had a problem with my DPF, so far, I do about 5k a year, most of those equate to about 2 miles a day for the dog walk.
So, you uses expensive Shell and no DPF issues.
and I use El Cheapo Tesco and no DPF issues.
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Are you sure that you have a DPF in your cars? Certainly the 56 reg doesn't.