How to make a stop using a Lube Service Type for just one vehicle
Since you are still using that old Lube Service Type on other you equipment do this.
Create a new Lube Service Type with the same name, but slightly different, to indicate it not in use any more.
Keep it active but make the intervals all zeros.
Then go to the equipment that is no longer using the original one.
Change the original one in all the previous lube services where it was used, to the new one you just created.
This will keep the history and the name that is similar but will not show up on reminders because it has zeros in the intervals.