How often does the supercharger oil in a 1998 Pontiac grand prix gtp have to be changed and is it harmful to the supercharger if it has not been changed for a long time?

Answer 1

Usually you should plan on changing your supercharger oil once a year or every 20-30,000 miles. And yes it can be harmful to the supercharger to not change the oil in it, just as not changing the oil in the engine would be not to change it. Folks the oil cooling the superchargers I am aware of is the same oil from the same reservoir as in the engine. So when you change oil in the engine you are changing oil in the Supercharger as well. If this is not the case, someone please tell me as well. The oil in the supercharger is not the same as engine oil. Do not use regular engine oil in the supercharger on the GTP, it requires special oil.

It is not connected to the same resevoir, it is totally separate.

The last comment informing that the Supercharger oil is entirely different and not connected to the engine oil completely correct.

Regarding charing the supercharger oil, the owner's manual states the following: "Unless you are technically qualified and have the proper tools, you should let your dealer or a qualified service center perform this maintanence."

The owners manual then goes on to state that the oil in the supercharger should be every 30,000 miles or 36 months - whichever is sooner.

To check your oil on the supercharger, do the following:

1. Make sure your engine is cold - i.e. at least 2-3 hrs after running.

2. Clean the area around the fill plug on the supercharger so no debris or impurities get in the system.

3. Remove the oil fill plug w/ a 3/16" allen/hex wrench.

4. The oil level is correct when it just reaches the bottom threads on the inspection hole.

5. Repleace the oil plug w/ the O-ring in place.

6. Torque to 88lb-in.

The type of oil for the supercharger is Supercharger Oil GM Part No. 12345982.

-gz1