Lysholm is now owned (partly?) by Vortech/Airpower group (not whipple afaik), but ESS already started shipping vortech oil with their kits before that. I bought my kit in early 2011 and it already came with the vortech oil.I can't say why ESS originally recommended Castrol. Maybe later they switched to the vortech oil that is used in their normal vortech kits thinking it would be just as good and maybe because vortech used it that it was a more supercharger-specific lube? I'm just guessing.
You are right, and I can't trust my memory anymore, ugg.Lysholm is now owned (partly?) by Vortech/Airpower group (not whipple afaik)
I still dont think it is severely bad to use the Catrol stuff. Like I said, I'm not aware of any failures. But, if you want to use what Lysholm says you should use, then the Nye variants are what you wantI called Lysholm directly and the correct oil to use is a vortech part number 009028. This is a synthetic oil specifically formulated for twin screw superchargers and is a much thinner oil than the motor oils such as the Castrol TWS 10w-60 that ESS specifies in their instructions. Lysholm says NOT to use anything other than the Vortech 009028 oil, especially not a motor oil. Part number 009028 is about $50 directly from Vortech.
Turns out this Vortech part number 009028 is actually Nye Synthetic Oil 605, which is also sold as Ford specification ESE-M99C115-A, and GM part number 12345982. Get the GM stuff, its about $12 for a 4oz/120ml bottle.