Alternative Supercharger Oil

[Grandfathers GS]

A popular topic on the intertubes over the years, I see. Some people can't find it, although nowadays available on Amazon.  But there are also people like me that don't like getting ripped off and/or are just curious.  All the alternative suggestions I came across are wrong in my not so humble opinion. Most suggest 10W-30 with changes at X number of miles.  Pure pull it out of the nether regions suggestions. 

The original oil is made by a company called Nye and is their number 605.  Ester based synthetic, viscosities given at the usual temps. Knowing that it's a simple matter to match up with engine synthetics.

Well, boys and girls, that falls between a typical 0W-20 and 0W-30.  Either would do, but I would lean to the 0W-20 since there is no need for high temperature viscosity. 

I can't imagine why the supercharger would need anything very special, although synthetic oil would offer better wear characteristics than mineral oil.  It lubricates two straight cut gears and the ball bearings.  The simplest possible duties for any lubricant.  You can be sure that for many decades all any roots supercharger drives used was mineral oil.  Probably non-detergent if you are old enough to remember such a thing.  Going to a synthetic with a high viscosity index offers benefits, but is not needed.

[Raffaelli]

I just bought some Eaton supercharger oil for a 2012 Range Rover sport a few month ago. I want to say it was like $30 a bottle.

 Something so cheap, keeping something so critical alive, why scrimp?

[White93z34]

I mean best case you save a few $$ on something that you change one or twice in the life of a car and come out ahead.

worst case you trash a supercharger.

Personally I would just pay the money for the correct oil.