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Damian Ware
Tinkerer
Victoria
Camry

Posts: 53
Reg: 10-2005

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Wednesday, February 22, 2006 - 04:52 pm, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I am interested to find out what are the negative effects of not doing a fluid change on a auto transmission.

The benefits are a older oil becomes thinner, which allows for faster gear shifting
Jason Kingsmill
DieHard
NSW
UZZ31 Soarer V8

Posts: 519
Reg: 07-2005

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Wednesday, February 22, 2006 - 05:56 pm, by:  Jason Kingsmill (Jason_k) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Damian, could lead to all sorts of problems if the oil has been cooked too much....

It could be thicker with all the sludge buildup, not thinner. The metal filings from meshing gears could become very abrasive, which is the opposite effect that oil should have.

For a small amount of money, you could fix all that.
Anish Varsani
TryHard
QLD
V8 UZZ30

Posts: 155
Reg: 07-2005

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Wednesday, February 22, 2006 - 07:36 pm, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Might get leaks from seals. Motor oils/fluids generally have seal conditioners that make seals swell to help them keep fluid inside.

If you don't want to flush the box, at least drain the sump at put in 2.5L of clean fluid to replace the additives in the fluid.
Damian Ware
Tinkerer
Victoria
Camry

Posts: 54
Reg: 10-2005

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Thursday, February 23, 2006 - 08:03 am, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I will change the fluid when it is due.

I was just thinking out loud as my bros VS commodoore had a strangely very large effect once oil was changed, it was very different to drive and very slow changing.
Anish Varsani
TryHard
QLD
V8 UZZ30

Posts: 159
Reg: 07-2005

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Thursday, February 23, 2006 - 12:17 pm, by:  Anish Varsani (Yomama) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Slow changing or you just didn't feel the shift shock?

I pulled the pan off my VP and found pieces of clutch material in the sump and filter. The fluid hadn't been changed until 150 000km. Gearbox was a quieter after a flush and the shift shock was lessened but still apparant. No fix for that one with swapping or overhauling the worn/shattered clutch packs.
Damian Ware
Tinkerer
Victoria
Camry

Posts: 55
Reg: 10-2005

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Thursday, February 23, 2006 - 12:38 pm, by:  Damian Ware (Frozenpod) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

There was no shock before the fluid change or after it was much slower.

But still my question is to the damage caused by old fluid, I am guessing wear and cooling issues are there any others.

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