Full confession....  I have virtually no expertise when it comes to the care-and-feeding of engines.  But I do change my oil frequently.  I bought my 1990 just one year ago, it now has about 145,000 on the original engine and trans, and I have no record of what service it had before that (there were several owners).

Today I was at my local Jiffy-Lube, and they offered me two "extras":

  1.. Flushing and re-filling the Automatic Transmission Fluid.  They wanted $89.99 for this. 
  2.. "Fuel System Cleaning".  They were to put some sort of additive into the gas-tank, then open up one of the vacuum tubes and drain some sort of cleaning fluid into the system.  They wanted $59.99 for this.
My impression is that shops like this use the oil change as the inducement to get you into the shop, then "get you" with the extras.

Does anyone have an opinion as to whether either of these processes are necessary, and if so, how often they should be done.

Thanks,

Fin Beven
1990 Carat, Custom Camper Conversion
Pasadena, CA