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Date:         Tue, 10 Jun 1997 10:54:23 -0400 (EDT)
Sender:       Vanagon Mailing List <vanagon@vanagon.com>
From:         SyncroHead@aol.com
Subject:      Re: How to change ATF in 90 Vanagon

In a message dated 97-06-09 13:59:30 EDT, kersey@outdoortech.com (Bo Kersey) writes:

> Taking one quart out and replacing it does not do that much good. I mean, > the quart that you take out is mostly new transmission fluid, isn't it.

No. Assuming (for the sake of nice even round numbers) that the trans held 5 quarts and that you drive the van in between to circulate & mix the fluid. Outside the US, please substitute the word liter for quart or qt. :-)

The first quart replaced is 100% old fluid. You'd have 4 qts old & 1 qt new. The next quart replcaed is 80% old, 20% new. You'd have 3.2 qts old & 1.8 new. Then...64% old, 36% new. You'd have 2.6 qts old, 2.4 new remaining. (48% new) Then...52% old, 48% new. You'd have 2.0 qts old, 3.0 new remaining. (60% new) Then...40% old, 60% new, You'd have 1.6 qts old, 3.4 new remaining. (68% new) Then...32% old, 68% new, You'd have 1.3 qts old, 3.7 new remaining. (74% new) Then...26% old, 74% new, You'd have 1.0 qts old, 4.0 new remaining. (80% new)

Then you changed 3 qts of fluid with new when you replaced the screen and seal. You'd end up with only 0.4 qts of the old stuff in there. That's 92% new, compared to only 60% new without the "flush" technique.

This gradual change MAY help keep the seals from leaking too. I haven't had a leak between the 100,000 mile change and the current 130,000 miles on the van. I made the change over several weeks with anywhere from 1 day to 2 weeks between the 1 quart fluid changes.

Regards, Jim Davis 87 GL Syncro 88 GL Wolfsburg


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