Automatic Transmission Fluid and Filter Changes - Mercedes Benz SLK Forum

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#1 Old 01-29-2018
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Automatic Transmission Fluid and Filter Changes

Hi all,

2001 SLK 320 at 59K miles.

I search in here and could not find a step by step instruction to change the above items. Has anyone here done this before? I have read the Operator's Manual and it states "Regular automatic transmission fluid level checks and changes are not required..."

1) What P/Ns are the Automatic Transmission Fluid, Gasket, & Filter that Mercedes uses?

2) If I were to schedule to have the shop done this service, how much approximately would it cost?

Thank you much!

Regards,

Wil
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#2 Old 01-30-2018
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Operator's manual speak with forked tongue

you do need to keep on top of your transmission fluid. There is no dipstick built into the trans, as in older cars, you have to buy one, or rely on your well-equipped mecahnic to have the relevant workshop tool. It's for the 722.6 gerabox if you want to search ebay etc for one for your self.
You'll probably not have had the trans fluid drained and changed on yours, given it's only done 59,000. It should be a priority for you. I acquired mine at 53,000, also never had it done. One of the first things i did to the car.
It's not tricky for a pro, or even a gung-ho diy'er, but it does need doing. As for cost, about 8 litres of trans fluid, depending on what you pay for it, and a filter, gasket and crush washer. Job time when I do it, about two hours.

Plenty of how-tos and wtf's on here. Search is your friend.
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#3 Old 01-30-2018
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https://www.pelicanparts.com/techart...ter_Change.htm
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#4 Old 01-30-2018
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If you look around parts suppliers there is usually a kit of parts you can buy for the fluid change on your car - gasket / washer / filter / fluid / pilot bush connector. Do make sure the kit includes the pilot bush connector as the O-rings fail on these and ATF then wicks up the cable and takes out the gearbox computer. Don't get cheaper patent parts - it isn't worth it. If you're lucky the kit will include the dipstick, but if not, go get one as it will greatly simplify filling up afterwards and checking after the first few runs.

The whole process is easier if you can get the car up on a lift. Try and clean the sump fully and make sure there's a magnetic plate stuck to the bottom of the sump. Remove this, check for swarf (there shouldn't be any), clean and replace. Don't use brake cleaner on the cables/pilot bush as it will dissolve the insulation. Use a proper electrical contact cleaner for the pilot bush and the cables. If the cables are soaked with ATF then check the gearbox computer which is situated in the passenger footwell, behind the carpet, the foam insulation and the metal plate. If there is ATF in the footwell get it all cleaned up (and check inside the gearbox computer too) with electrical contact cleaner. Once clean, make a point of checking again two weeks later to make sure you've got it all. See my thread about this if you want a bit more detail

Good luck
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#5 Old 01-31-2018
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Thank you much! Very helpful link and advises.
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#6 Old 01-31-2018
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Nice video here as well:

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#7 Old 02-01-2018
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Quote:
Originally Posted by Elmer Fudd View Post
you do need to keep on top of your transmission fluid. There is no dipstick built into the trans, as in older cars, you have to buy one, or rely on your well-equipped mecahnic to have the relevant workshop tool. It's for the 722.6 gerabox if you want to search ebay etc for one for your self.
I made my own dipstick using these measurements.
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#8 Old 02-01-2018
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Thanks Duncanj & slk230red!

Found these in Ebay. Are these legit?
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#9 Old 02-01-2018
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My 1999 SLK230 had a drain plug on my torque converter. Took a flathead screw driver and turned the flywheel one tooth at a time till I could get at the drain bolt on the torque converter. That way you get almost all the trans. fluid out except the little bit in the trans cooler in the radiator. Not all of them have the drain bolt on the torque converter.
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#10 Old 02-02-2018
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Quote:
Originally Posted by DucatiSteve View Post
My 1999 SLK230 had a drain plug on my torque converter. Took a flathead screw driver and turned the flywheel one tooth at a time till I could get at the drain bolt on the torque converter. That way you get almost all the trans. fluid out except the little bit in the trans cooler in the radiator. Not all of them have the drain bolt on the torque converter.
I think the drain plug on the torque converter was removed on the face-lift models.
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#11 Old 02-02-2018
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I'd do the diff as well.

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#12 Old 07-12-2019
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The downside on changing the automatic transmission oil as a DIY project is that you only replace 1/2 of the oil if you don't drain the torque converter which you can't do on most of the SLKs.

The tranny and converter holds 10 or so liters so that would leave 5 liters of old oil in the tranny. Do it again and you have 2.5 liters old left in. Once more then you have 1.25 old oil. Etc. etc.

This would get extremely expensive to get the old oil contamination down to an insignificant quantity.

If you have a dealer change the filter and flush the tranny you have new oil all at once.

I'm going to check the cost of this service for my 280.

Past that if your only concern is replacing the filter and cleaning the magnets DIY is the way to go.

Dennis
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#13 Old 07-12-2019
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Hi,

When we used to do total rebuilds on 722.6's including rebuilt converter and flushed / blown clear cooler system, they usually took around 7 litres to fill from totally empty, but this does vary from 5 litres to 9 litres depending upon the exact 722.6xx model number.

If you don't have a drain plug in the Converter, you can empty a lot from the Converter plus Cooler and Lines by removing the Cooler Banjo's and blowing the old Oil out with compressed air

You only have around 1 litre left in the whole Trans system by doing it that way

A total fluid exchange flushing machine will need 12 to 16 liters of fluid.

HTH, Cheers Dave
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#14 Old 07-12-2019
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Quote:
Originally Posted by myeeplacee View Post
The downside on changing the automatic transmission oil as a DIY project is that you only replace 1/2 of the oil if you don't drain the torque converter which you can't do on most of the SLKs.

The tranny and converter holds 10 or so liters so that would leave 5 liters of old oil in the tranny. Do it again and you have 2.5 liters old left in. Once more then you have 1.25 old oil. Etc. etc.

This would get extremely expensive to get the old oil contamination down to an insignificant quantity.

If you have a dealer change the filter and flush the tranny you have new oil all at once.

I'm going to check the cost of this service for my 280.

Past that if your only concern is replacing the filter and cleaning the magnets DIY is the way to go.

Dennis
Stopped by my dealer today and got a quote for the above service - $780.00 US.

My plan is to do it myself and change the fluid several times (my car does not have a converter plug) to get rid of most of the old fluid because I have no idea of what brand is in the tranny. In doing this I will not torque the bolts or seal the gasket until the last fill.

Dennis
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#15 Old 07-12-2019
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Quote:
Originally Posted by Dave2302 View Post
Hi,

When we used to do total rebuilds on 722.6's including rebuilt converter and flushed / blown clear cooler system, they usually took around 7 litres to fill from totally empty, but this does vary from 5 litres to 9 litres depending upon the exact 722.6xx model number.

If you don't have a drain plug in the Converter, you can empty a lot from the Converter plus Cooler and Lines by removing the Cooler Banjo's and blowing the old Oil out with compressed air

You only have around 1 litre left in the whole Trans system by doing it that way

A total fluid exchange flushing machine will need 12 to 16 liters of fluid.

HTH, Cheers Dave
Thanks Dave,

Good ideas. I'll try your way first and see how much fluid I can extract.

Dennis
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#16 Old 07-12-2019
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I found reference to a drain screw in my torque converter based on my VIN. It is supposed to be behind a cover on the lower part of the bell housing.

I will have to investigate this further but if it is correct I do have a converter drain screw and will be able to drain the converter.

Any suggestions, cautions or advice would be greatly appreciated.

Dennis
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#17 Old 07-12-2019
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Quote:
Originally Posted by myeeplacee View Post
Stopped by my dealer today and got a quote for the above service - $780.00 US.

My plan is to do it myself and change the fluid several times (my car does not have a converter plug) to get rid of most of the old fluid because I have no idea of what brand is in the tranny. In doing this I will not torque the bolts or seal the gasket until the last fill.

Dennis

Go find an good indy to do it. That is an "I don't want to do it price".
A good indy who knows these cars will be find. Ask around for one in your area.

I am not at home to access my records but when I got the current 2001 SLK320 last July I took it in to TCM a local indy specializing in MB cars. I had the connector replaced, filter replaced, new magnet and gasket, full drain of the TC and the trans with refill of all and the bill to the best of my recall was around $325 CDN.
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#18 Old 07-13-2019
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Hi,

If you do have a converter drain, still disconnect the cooler lines and blow that through as well, that way the only old oil left will be inside the Valve Block and Tranny Clutch Drums, I doubt that will total more than 0.75 litre so as long as the old oil isn't absolutely black and minging then don't even worry about it.

HTH, Cheers Dave
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#19 Old 07-13-2019
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Quote:
Originally Posted by myeeplacee View Post
Stopped by my dealer today and got a quote for the above service - $780.00 US.

My plan is to do it myself and change the fluid several times (my car does not have a converter plug) to get rid of most of the old fluid because I have no idea of what brand is in the tranny. In doing this I will not torque the bolts or seal the gasket until the last fill.

Dennis
Quote:
Originally Posted by Alex 3 View Post
Go find an good indy to do it. That is an "I don't want to do it price".
A good indy who knows these cars will be find. Ask around for one in your area.

I am not at home to access my records but when I got the current 2001 SLK320 last July I took it in to TCM a local indy specializing in MB cars. I had the connector replaced, filter replaced, new magnet and gasket, full drain of the TC and the trans with refill of all and the bill to the best of my recall was around $325 CDN.
Dont know how much difference (parts/labour) between yours and mine but had my 172 done last year and it was ~$450 CDN (so roughly $350 U.S. ). Kept it overnight to allow a full drain etc The refilling part IIRC is what takes the most time.


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#20 Old 07-13-2019
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Dont know how much difference (parts/labour) between yours and mine but had my 172 done last year and it was ~$450 CDN (so roughly $350 U.S. ). Kept it overnight to allow a full drain etc The refilling part IIRC is what takes the most time.

The R172 has the 722.9 7 speed transmission which is a different animal than the 722.6 5 speed so I suspect the capacities are different. Also, I had mine done at TC Motors in Victoria who do not charge the same labour rates as MB across the block. My cost included a new TCU.
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