Transmission fluid additives - Rolls-Royce and Bentley Forums
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post #1 of 14 (permalink) Old 11-13-2019, 02:28 PM Thread Starter
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Transmission fluid additives

Hello again!

I posted recently on a delay when engaging reverse in my 79 Silver Shadow 2. I suspect the cause of the slippage may be hardened seals and that a transmission seal renewal is on the horizon, but getting the transmission out will require some planning. In the meantime I was advised that I may buy some time by using an additive such as K&W Trans-X.

What advice do the experts here have regarding the benefits/disadvantages of transmission fluid additives and what additives if any would you recommend for this purpose in this car (preferably available in the UK)?

Thanks.
Peter

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post #2 of 14 (permalink) Old 11-13-2019, 02:47 PM
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Have you properly checked the level? Trans are big hydraulic pumps that require clean fluid to work. You may also have a dirty filter, worn bands, etc. The TH400 is a very robust transmission.

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post #3 of 14 (permalink) Old 11-13-2019, 03:11 PM Thread Starter
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Thanks Wraithman, that's encouraging.

I will change the filter and sump gasket first. The fluid colour is not too bad and doesn't smell burnt. If I understand correctly I can only change about half the fluid by draining it through the sump drain hole because the rest is in the torque converter.

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post #4 of 14 (permalink) Old 11-13-2019, 03:12 PM
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Hi,


I have always considered most aftermarket additives as 'snake oil'.


That said I do add ZDDP to my oil on some cars I have since the oil manuafcturers have drastically reduced or elimiated it..............no oil wars............


Also at Jaguar, especially on the old XJS we used to suffer diff whine on the GKN transmission axle. It was not every car, probably 1 in 500 and despite detailed teardowns and individual part by part inspections no one could ever find out the root cause.


The manager who was the specialist used to come with a small container of liquid about the size of a table salt condiment. Once that was added the whine disappeared. I asked why don't you just put it in every car........after a tribology lecture and the fact the tiny little bottle of what he had cost around £30, he said we only do it when there is a problem.


So additives can work I suppose is the answer. That said do the usual checks as wraithman says and if all fails then it appears you have nothing to lose so worth a try and if something does show a result let us know.


Steve
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post #5 of 14 (permalink) Old 11-13-2019, 03:15 PM Thread Starter
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"if all fails then it appears you have nothing to lose so worth a try and if something does show a result let us know."

I will certainly do that.

Peter

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post #6 of 14 (permalink) Old 11-13-2019, 03:21 PM
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Peter, have you ever replaced a transmission filter? You may want to check the level first, it may need fluid. Question, do you know how to check it?
If not, we can help.

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post #7 of 14 (permalink) Old 11-13-2019, 03:52 PM Thread Starter
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Hi Wraithman

No to filter replacement, and sort of to checking the level (learned by an error):

Actually I checked the level cold and it was below the tip of the dipstick so I topped it up to halfway from the tip to the minimum, then drove it for a couple of miles which blew tx fluid up the dipstick (oddly enough my wife's new name for me!) and made lots of white smoke as it hit the exhaust manifold.

Bottom line is I did learn how not to do it!

Any advice very welcome.

PH
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post #8 of 14 (permalink) Old 11-13-2019, 05:31 PM
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Better than oil additive , use a premium quality oil, such as Dexron III (H) for your car.
High quality oil do not need additive because they have some yet. Adding others may have wrong effect and some unwanted consequences.


Oil level : never cold, but hot after driving minimum 20 km,with engine iddling on park


You should check again, you may have too much oil which is very bad.


Good idea in any case to drain oil and clean filter. If oil is dirty and smell, you may have ta change it 2 or 3 times

97 Continental R
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post #9 of 14 (permalink) Old 11-13-2019, 08:36 PM Thread Starter
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Thanks Jean7.

I have read that too much oil is very bad but apart from frothing and overspilling, why is it so damaging?

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post #10 of 14 (permalink) Old 11-14-2019, 12:50 AM
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I like this stuff because of what's in it.



Nothing wrong with a bit of mystery
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