I searched and read numerous posts on this topic, and am still not sure if the supercharger oil should be changed only after 100K. I just purchased a 00 XJR, the vehicle has 87,500 miles and I am having the dealership replace the tensioners, timing chains, drive belts etc and my mechanic will change all the fluids for the 90k service.

Should I leave the supercharger oil alone for now? There was quite a debate in one of the threads about the correct procedure and I walked away with the understanding after reading posts from experienced members like Sean B. that the correct way to do this is to get the supercharger out for this.

Please share your thoughts when time permits.

There are few reports of supercharger failures and plenty of superchargers that have gone many more that 150,000 miles on the original oil. Unlike an engine, there are not combustion components trashing the oil and unlike a transmission, there are not clutch plate wear particles loose in the oil. So, change it to feel good about yourself, or don't. My old MY 98 XJR covered 250,000 miles and has plenty of cosmetic and trim issues, but the supercharger is plenty strong and quiet, on what I am pretty sure is the original oil. I changed the oil on my MY 99 XJR at 150,000 miles since I had the supercharger out for head gasket work.

Are you changing the differential lube, the steering fluid, the coolant, and the brake fluid, too? All of them would seem every bit as important, if not more so that the blower oil.

might as well ...

1) job takes at most an hour ... removing blown blower would take longer than that

2) gm who sells the oil and uses eaton blowers on some models specs 30k miles

3) at 90k miles the oil will be uuuuugly

I've mellowed on the subject, a sloping path helps, **** up

But as it's getting the front end off a bench fill along with new coolant hoses that run underneath it might be a nice preventative measure.