Opie oil man - supercharger oil Q

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This question's intended for Opie oil man - though anyone with the answer is welcome!!

I have a 1994 porsche 993, and run it on mobil 1 motorsport oil. The engine's done 74k miles so I tend to seek out the 15W/50 as it tends to consume the 0W/40 a bit more rapidly. Obviously an oil/air cooled engine needs oil that is good at high temps, when the 993 is stuck in traffic, the oil temp gets fairly high compared with your average water-cooled motor.

I have had a supercharger fitted, which is very cool - this is an Eaton M90 unit IIRC. The supercharger is sold as an oil-sealed unit, zero maintenance required. Is this likely? Presumably the supercharger has its own oil supply, it is possible that the oil would never need to be changed?

I've never heard of the superchargers blowing up due to oil problems, but I'd like some technical reason why - after all the internals are spinning at high speed under load.

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Isn't the M90 a newer design than the M112? The Eaton website claims the M90 is good for 150k miles without any maintenance. No mention of whether 'maintenance' means oil changes though.

[cyberface]

fair enough - if the oil's rated to last 90k miles then no worries!

The charger is currently supplying a max 6 psi IIRC so it's not exactly under huge stress.

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Thanks very much - will consider the Silkolene for next oil change