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How good is your oil? - Metropolis.
I thought some of you might find this of interest if you didn’t know already, there is an independent UK verifier of oil spec

ukla-vls.org.uk/

I didn’t realise they existed till a YouTube channel I watch mentioned them.

Video in question: youtu.be/AK6BF4qQrGw?si=X4tDVUTQwpFukqmK

How good is your oil? - edlithgow

Actually "How Compliant Is Your Oil"

Not necessarily the same thing.