Super Knock code (No Cel or Pxxxx codes)

Since taking ownership of my 2009 JCW Clubman R55 last May, I've had several occurrences of
about a half second of lost power while accelerating followed by the appearance of two codes on
full scans of the whole system with my Schwaben (Foxwell NT510) scanner.
These are the alphanumeric codes in the DME engine management section of a full auto-scan
(not an OBDII Pxxxx code) and are for superknock on cylinder 4 (or 1 or 3, etc. different cylinders each time)
and a fuel cutoffcode for the same cylinder.
No CEL and no stored or pending codes on an OBDII scan. I take note of the DME code and erase it, and it
happens again only once every month or so. I scan it about once a week and the code doesn't recur
until the same brief hesitation on acceleration occurs again.
I've read that many if not most N14 R56 models tend to have these particular codes stored on them, so
I'm not too freaked out, but wondering if there is a real problem that needs to be addressed (intake
valve crud, Vanos issues, timing chain guide issues, etc.).
I have less than 33,000 miles on the car (about 4,000 by me), and don't hear any suspicious noises on startup
to suggest chain tensioner problems (just the sewing machine tap of the DFI), have new OEM plugs, and
no other associated codes or issues.

 

Helix is just a little far to go since Swedish
Motors is just across the Susquehanna
from me in Marietta and they have
extensive MINI experience and training.
If I were closer I’d go to Helix.

 

Thanks all.
I will think hard about this between now
and the next time it occurs.

 

After having DTCs (but no CELs) for superknock about once every 2-4 weeks for most of a year,
I have had not had any in the last 3 months shortly after changing to SN+ rated oil this spring.

 

Used about half Amsoil 5W30 XL (almost A3/B3 with HTHS of 3.3) and half Mobil 1 10W30 High Mileage (slightly more viscous than I want but it's the only A3/B3 rated SN+ oil I know of).
(Of course now that I've said posted this, I'll probably start getting DTCs again - I scan once or twice a week to check for this).

 

SN+ oils are made with more magnesium and less calcium and other factors(reducing deposits) that lessen the formation of small oil/fuel droplets
that make their way into the combustion chamber
and promote LSPI (low speed pre-ignition) in TGDI engines.

 

One was thinner than I wanted per hths
and the other is a bit thicker at 40C
than I wanted,so I mixed them instead of
choosing one or the other. Couldn’t find a
single SN+ oil that checked all my boxes.
I’m not inclined to believe that some
horrible interaction or reaction will
result from combining them together
In the same oil pan and engine.