Auto trans question
Thread Starter
Instructor
Joined: May 2015
Posts: 145
Likes: 1
Auto trans question
Hi everyone,
The project is going well but I have a couple of questions about changing the fluid. 1st Quest What trans fluid does everyone suggest - I am thinking Castrol Dex III premeum is a good choice but I would like to know what you think. 2nd quest - After draining the fluid and putting in the new WIX filter, I measured the fluid I removed, about 5 3/4 Qts. I realize I cant get all that back in static. The question is, do I start it, pull the plug, then start pumping the rest of the fluid in with my fluid transfer pump till it starts to run out?
Any advise that you have is greatly appreciated
Yellow '01
The project is going well but I have a couple of questions about changing the fluid. 1st Quest What trans fluid does everyone suggest - I am thinking Castrol Dex III premeum is a good choice but I would like to know what you think. 2nd quest - After draining the fluid and putting in the new WIX filter, I measured the fluid I removed, about 5 3/4 Qts. I realize I cant get all that back in static. The question is, do I start it, pull the plug, then start pumping the rest of the fluid in with my fluid transfer pump till it starts to run out?
Any advise that you have is greatly appreciated
Yellow '01
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Yes the car has to be running in order to check the fluid level correctly----Plus it must be warmed up---You must also shift it into reverse and drive and neutral several times to get all the air out of the system--- I am not a big fan of synthetic trans fluid that is your decision--The factory recc. fluid is the best choice---
Thread Starter
Instructor
Joined: May 2015
Posts: 145
Likes: 1
Yes the car has to be running in order to check the fluid level correctly----Plus it must be warmed up---You must also shift it into reverse and drive and neutral several times to get all the air out of the system--- I am not a big fan of synthetic trans fluid that is your decision--The factory recc. fluid is the best choice---
Melting Slicks
Joined: Mar 2012
Posts: 2,800
Likes: 456
From: USA
transmission fluid
The recommended fluid for the c5 when they were new was Dexron III. GM has updated their recommendation to Dexron VI, which is a semisynthetic fluid to the best of my knowledge. When I changed my fluid I went with Dexron III I purchased at a local auto supply. It is still available. I would just go with the Castrol Dexron III you originally talked about. Good luck 
Thread Starter
Instructor
Joined: May 2015
Posts: 145
Likes: 1
The recommended fluid for the c5 when they were new was Dexron III. GM has updated their recommendation to Dexron VI, which is a semisynthetic fluid to the best of my knowledge. When I changed my fluid I went with Dexron III I purchased at a local auto supply. It is still available. I would just go with the Castrol Dexron III you originally talked about. Good luck
Thanks for the advise on this subject, its great to have some real professional help
Thread Starter
Instructor
Joined: May 2015
Posts: 145
Likes: 1
