Centrifugal / Rotrex Supercharger Oil

[KTMsm]

I need to top up my HKS supercharger

It's a centrifugal type

I thought Eaton took the piss with their oil at around £30 for 100ml

However HKS want £345 for 800ml !

I struggle to believe it requires anything better than fully synthetic motor oil

If an exhaust driven turbo can run on it, which is a harsher environment, I find it hard to believe a belt driven one can't

However does anyone know the requirement or justification for the price ?

[KTMsm]

Thanks gents - I did have a google before asking but couldn't find anything useful

The HKS is only similar to a rotrex ? I assumed it would be identical