If a fluid meets the spec it meets the spec, however there is some tolerance in specs so they are not identical, if you see what I mean.
Lots of people have used Mannol fluids with success - in fact I cannot recall anyone reporting using a correct spec fluid of whatever brand and having an issue with it.
I'm happy with a full machine change, as is the well-known specialist I use, but as you say, some believe them to be the invention of the Devil himself...
Pays your money and gets as confused as the rest of us!
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