My series 80 dryer squeaks

Do not lubricate anything in a dryer you will damage .locate the the squeek if it is coming from the rear of the unit most likly need to replace the drum support or wheels if its intermittant and has a squeek squeeek noise that either gets worse or goes away when the dryer heats up the tensioner pully or the moter berrings are bad

I suggest you replace the drive belt.The belt can slip and cause the squeaking noise. Also check for wear on the support rollers.
Hope this helps.