The grading system you are listing does not spec for wet clutches.
It's just a basic grading system for the quality, nature/origin and compostition of the base oils.
What you are looking for is a round symbol stating friction reduction additives. If it has these additives you will immediately need a new clutch.
The general magnetic oil is Castrol's Magnatec/Edge range for petrol and diesil cars. (other brands also have 'magnetic oils) They will 100% wreck your clutch.
I've used car oil before, but I was using the very basic stuff due to the mileage I was doing at the time and the engine had an easy life but lots of commuting miles and regular oil and filter changes.
I would not use any non specific bike oil unless you are 100% certain it OK for the clutch.
If you had an old BWM/Guzzi with dry clutch and old crap will do.
