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» C5Forum.com » C5 Specific Topics » C5 Technical and Performance » Tranny Fluid & Filter Change vs Flush only

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Author Topic: Tranny Fluid & Filter Change vs Flush only
Pewter1
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I am contemplating having my A4 Trans fluid and filter changed, and going with Mobile One Synthetic. I have talked with the two Chevy dealerships here in Grand Rapids MI, and both have said to do a flush with a pump system, that will totally clean my system out of the old fluid. With me already having my own fluid and filter kit the one dealership tells me it will run $170.00 and the other $112.00, big difference right? Well the first dealership says it will take 14 quarts, and the second does not know. I also called a Transmission shop here, and they told me that a flush was the worst thing that you can do to a transmission. The told me that they would drop the pan, and change the filter and open one of the return lines to the cooler and that it would take between 6-10 quarts, and cost me around $50.00.... Looking for some good advice on this one, maybe C4C5 Specialist could help me with his input since he is the man! Thanks in advance. My car has 43,000 miles on it. [Confused] [Cheers] [Save the Wave!] RWhitmor@Steelcase.com [/IMG]

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Pewter1
RWhitmor@Steelcase.com
98' Pewter/Black Convertible
Chrome Wheels,Exhaust Plate, Vortex Rammer, WCC Power Duct, Magnaflow Cat Back Exhaust, Fuel recurve hose, Steering wheel cover,Steering Wheel Decal, Chrome lettering front & back, Throttle body bypass, Z06 Front Grills, Z06 Brake duct grills, Z06 side grills, Chrome exhuast plate, Michillen Pilot Sport Runflats, Airbag letter kit, Carbon Fiber Blackouts for Front and Rear...of course more to come!

Posts: 113 | From: Grand Rapids, MI | Registered: Jul 2001  |  IP: Logged | Report this post to a Moderator
BruceF
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According to the manual, a drain and fill should take 5 quarts. An overhaul (which I assume is closer to the right amount for a drop the pan and change the filter) would be 10.8 quarts.

It is my understanding that the power flushing has a tendency to loosen up sludge and cause problems later on.

According to the manual, it would seem like the drop the pan and filter change is the way to go.

Posts: 4601 | From: Long Island, NY | Registered: Nov 2000  |  IP: Logged | Report this post to a Moderator
Buzzer
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If a flush is done properly then it should be OK, but I'm with Bruce on this simply stated I don't trust any place to do the proper work. Just get a filter, drop the pan and replace the 5 or so quarts. I would then perform it as a regular maintenance item. Say at 15K or so.
Posts: 2193 | From: Virginia | Registered: Dec 2000  |  IP: Logged | Report this post to a Moderator
97silverbullet
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I agree with BruceF and Buzzer.

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'97 Corvette 13.29 @ 105 MPH

Posts: 248 | From: Ohio | Registered: Jul 2001  |  IP: Logged | Report this post to a Moderator
c4c5specialist
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Hi there,
While there are many schools of thought on this, fact must be understood.
First, total flush of old fluid is a very good idea.
Also, a filter change MUST be done.
Heres why, in an automatic transmission, your filter has about 60-80 inches of mercury vacuum, when the transmission is working. Now, at this point, you can see that, anything that might break, inside your transmission, and drop into the fluid sump, will almost immediately get sucked up into the filter, and not be left in the pan.
Personally, unless you do NOT change your fluid ever, a flush will never harm your transmission, unless it is not done correctly. Usually, a flush causes damage when your transmission is fully varnished, and has alot of build up on the clutches, and the band. Now, add a fresh fluid change, and all the new detergent additives, loosen all the old varnish, and it will cause major havoc.
Normally, I will change the filter first, break it open, and inspect the filter media, for any particles and signs of abnormal wear. If after that time, it all looks good, I will do the fluid flush, but NOT until I inspect inside the filter.
I hope this helps, and ask them if they will inspect the filter before you proceed, and show it to you.
Besttoyou, and please keep me posted as to how you do.
c4c5 [Hammer]

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c4c5 Chevrolet dealership mechanic, ASE Master Technician w/L1. COFFEE ADDICT. A persons judgement is only as good as the information they have, which should be FACT, not fiction.

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Posts: 1612 | From: conn | Registered: Jul 2001  |  IP: Logged | Report this post to a Moderator
   

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