You are here:

Cadillac Repair/1988 Deville 4.5


Rob  -  I have heard that some GM automatic transmissions require a special type of transmission fluid to prevent deterioration of the seals and gaskets.  Is this true?  Does the '88 Deville require this type of transmission fluid?


If the transmission has not been serviced for 26 years, one does not need to worry about deterioration to the seals or gaskets because whatever would happen has already happened or is going to happen.
Unlike engine oil, we naturally forget to maintain the transmissions, cooling system, final drive and braking hydraulics. Time goes by so quickly. 10 years, 20 years. Anti freeze starts breaking down after 3 years. Transmission should be serviced in 5 years. Brake system should be bled every 5 years.
On your 88 de ville if it has a dip stick tube, you can have it flushed and put in the fluid recommended in the owners manual. I would also recommend dropping the oil pan and changing the filter.
If no dipstick tube instead of an oil change place you will need to go to Cadillac because they have the fittings for flushing.
Good luck!


Cadillac Repair

All Answers

Answers by Expert:

Ask Experts


Rob Painter


Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?


Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

©2017 All rights reserved.