504 & 507 spec is mandatory because of the DPF. These oil have low sulfur / metal content saving DPF. Nothing to do with tensiometer... For tensiometer any good oil is OK but you need to follow 504/507 spec due to DPF on your vehicle.Yeah I can’t find a single case where it’s caused engine failure. Been watching this for past year so I’m not concerned in the least. I am going to change oil though just as a test to see if it effects this issue or the valve tapping at startup in cold weather. Currently my shop is using Eneos synthetic which meets the 504 and 507 spec.
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