Auto Transmission Fluid Change - Anyone Done It?

[toffee_pie]

3 minutes ago, Mr Vlad said:

There's been too much negatively regarding flushing an automatic gearbox. Don't flush because it'll knacker the gearbox. My question is Where Is The Proof?

I've talked with specialists who work on gearboxes on Porche BMW Ferrari Rolls Royce etc etc and they advocate flushing. 

Negative for a reason, it's snake Oil. What do you want to achieve by flushing oil, leave it alone and replace with more oil, preferably good quality oil such as motul which is far better than flushing it with solvent fluid and replacement with something generic that the main dealer use, I doubt they would go to the expense of using motul but still find the need to charge 400/500 quid for a 20 minute job 

[Mr Vlad]

Where is the proof Bill?

[toffee_pie]

35 minutes ago, Mr Vlad said:

Where is the proof Bill?

Where is your proof it works? common sense prevails - changing fluid / filter is all that needs to be done. no need to flush anything - all you are doing is flushing your wallet

Most automakers recommend against using an external machine to flush transmission fluid. Among other reasons, this is because these machines, (especially when connected improperly) can block or pressurize the wrong passages inside the transmission and cause damage. Some machines will run the transmission pump dry as they remove more fluid than they add back in. Flush machines, unless meticulously cleaned out between different vehicles, can also pump a small amount of the wrong fluid into your transmission. Even if there’s only a small chance of your transmission being damaged by a flush machine, why risk it?

As mentioned above, a transmission flush (using an external machine) may not be good for your transmission. Here is an excerpt from a General Motors technical service bulletin that provides their opinion on transmission flush machines:

Flushing of air conditioning (A/C) lines, radiators, transmission coolers, and power steering systems are recognized practices to be performed after catastrophic failures or extreme corrosion when encountered in radiators. For acceptable A/C flushing concerns, refer to the Flushing procedure in Service Information (SI). This practice is not required or recommended for normal service operations.

The use of external transmission fluid exchange or flush machines is not recommended for the automatic or manual transmission. Use of external machines to replace the fluid may affect the operation or durability of the transmission. Transmission fluid should only be replaced by draining and refilling following procedures in Service Information (SI). Refer to Automatic/Manual Transmission Fluid and Filter Replacement.

[Mr Vlad]

I don't have any proof it works Bill. Only the words from specialist auto gearbox service and repair garages. 

Sorry but what you, it looks copy and pasted, is just an opinion.

The only proof a flush works or not is by looking at a gearbox before it's flushed and by that I mean its stripped and after a flush when it's done a few thousand miles. 

[Mr Vlad]

I found this video. It's the only one I've seen where our gearboxes fitted to our cars is totally stripped showing all the pieces that make up the gearbox. I found it fascinating and an eye opener.

Nothing seen where particles can block oilways that I can make out.

 

[toffee_pie]

9 hours ago, Mr Vlad said:

I don't have any proof it works Bill. Only the words from specialist auto gearbox service and repair garages. 

Sorry but what you, it looks copy and pasted, is just an opinion.

The only proof a flush works or not is by looking at a gearbox before it's flushed and by that I mean its stripped and after a flush when it's done a few thousand miles. 

Its an opinion from GM, probably more also if you ask - of course garages will recommend a flush - they want the cash

[toffee_pie]

2 hours ago, Mr Vlad said:

I found this video. It's the only one I've seen where our gearboxes fitted to our cars is totally stripped showing all the pieces that make up the gearbox. I found it fascinating and an eye opener.

Nothing seen where particles can block oilways that I can make out.

 

I dont know about you but most of these holes we speak of are tiny and in the microns - my eyes are not that good, its not like you are looking for 5mm bolts