I had mine changed preventative a few years ago around 120k. No issues. I recall something about aircraft grade Shell oil (?)...

 

Update. I drove the car yesterday. The clicking and chirping I used to have on startup are gone. I wonder if it wasn't the belt and maybe just the fluid in the supercharger was too low or worn out, or both. It was eerily quiet.

I'm prepping the car for storage for the winter, so not sure how many more times I'll be able to run it this fall.

 

Good to hear.

I too was surprised by how much difference just changing the oil made in the "sound" of the SC at idle.

 

Gentlemen,

As I said earlier, change your Supercharger's oil with GM Supercharger oil! It cost about $16.00 a bottle and you need (2) bottles....The GM Supercharger is the same old Supercharger that's on the 2003 up XKR's.....I don't recall ever having any Supercharger whine even today with 90,000 miles on it.......Just remember every 20,000 miles........Hey it's Oil and Oil is to lubricate!!!!

Billy Clyde in Houston