Do you change the oil in an SLK gearbox?

Brian23

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I have, as you can tell by all the posts, bought my wife a lovely 1999 SLK 230. I was going to change the Oil and filter in the gearbox as a matter of course when I get a different car, but it says in the hand book that it is permanent fill. Does this mean that you never have to change it? If you should change it then how often? and with what oil if you do. I have no reason to believe that there isn't enough oil, just that it is 10 years old. I take it that there is no way of checking the level?
Brian
 

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Hello Brian,, the oil level is checked via the standpipe on the side of the box,, the oil should be good for at least 100k
 
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Brian23

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The dipstick says for MB servicing only, or am I looking at the wrong thing?
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The dipstick says for MB servicing only, or am I looking at the wrong thing?
Brian

No dip stick on this one. 41 is the fill up plug and 38 the drain
 

MB TECH WARRINGTON

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I have, as you can tell by all the posts, bought my wife a lovely 1999 SLK 230. I was going to change the Oil and filter in the gearbox as a matter of course when I get a different car, but it says in the hand book that it is permanent fill. Does this mean that you never have to change it? If you should change it then how often? and with what oil if you do. I have no reason to believe that there isn't enough oil, just that it is 10 years old. I take it that there is no way of checking the level?
Brian

change it every 37k, dont listen to the filled for life crap.
Mercedes stated this about the tiptronic box then brought it down to 80k, then 60k, now 37k.

Get it changed or risk a rebuild, a no brainer to me.

We have had many a autobox rebuilt.
 
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Brian23

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change it every 37k, dont listen to the filled for life crap.
Mercedes stated this about the tiptronic box then brought it down to 80k, then 60k, now 37k.

Get it changed or risk a rebuild, a no brainer to me.

We have had many a autobox rebuilt.

Ok thanks for that and should I only use MB oil??
Brian
 

OlafMaxwell

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I fully agree with MB Tech. I hav ethe 5 speed auto, now on 160k miles, had a second fluid change last November. It seems it will last quite well as long as you change the fluid as recommended, more frequently as it gets older too.
 
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Brian23

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Thank you

I'll agree with that entirely. When you drain at 50k miles and see the condition of it, you will wish you had done it sooner.

Thank you for the help, next question is: How much oil is in the GBox. and also how do you check the level if there is no dip stick? or is there a tool that you can buy
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There is a stand pipe and you just fill to the top till no more goes in
 

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Now that I am with the right box,,,your car holds 7.5 liters from new,,are you going to empty the torque converter, if not it will take about 3 to 3.5 liters,,if you empty the converter, around 6.5 liters.

MB fluid only
 
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Brian23

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I will empty it all. MB say it takes 11Lts
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racall

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I recon it will take about 6 to seven liters with the torque converter and a gasket and electricial plug
As you will need a dipstick as well i recommend you pop down to ollies and get a profensional to do the job

Ps i wish the forum had a spell cheker
 

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so why do benz not reccomend more than a once only change, and not even that on the first 722.6 boxes? we reccomend a change at, say, 30-50k then every 150k or never. boxes with other faults going into emergency program will wear the clutches quicker due to hard, unmodulated shifting. a box performing correctly with the correct oil level will not dirty it`s oil after that initial breaking in period and first change.

this, my opinion, is one of many dear poster. but ask yourself why we dont change steering/suspension/diff oil anymore but still change engine oil - the answer is that modern synthetic oils only degrade by contamination (mostly through the bores on engines), by extreme thermal overloading or by mechanical overloading of film strength and consequent particule contamination. when all is well in your auto box none of these situations will occur, when they do an oil change will not help!!
 

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so why do benz not reccomend more than a once only change, and not even that on the first 722.6 boxes? we reccomend a change at, say, 30-50k then every 150k or never. boxes with other faults going into emergency program will wear the clutches quicker due to hard, unmodulated shifting. a box performing correctly with the correct oil level will not dirty it`s oil after that initial breaking in period and first change.

this, my opinion, is one of many dear poster. but ask yourself why we dont change steering/suspension/diff oil anymore but still change engine oil - the answer is that modern synthetic oils only degrade by contamination (mostly through the bores on engines), by extreme thermal overloading or by mechanical overloading of film strength and consequent particule contamination. when all is well in your auto box none of these situations will occur, when they do an oil change will not help!!

It was interesting that MB only changed the fluid on the cars when they went over to assyst,,once only at 40k miles.

By pulling the dip sick and looking at the fluid can tell you quite a lot.

I would have qualms about leaving the fluid for a fair time after the 40k change
 

gre1591

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I had my first gearbox oil change done at 70,000miles (Car is an early 95- C200 with a 3 speed auto box) on a recent service @110,000 miles and I asked for it to be changed again but the technician said there was no need as it had only done 40,000 since the last gearbox oil change and the type of oil they used (probably shell) does 90,000 no problem.

Is this older mechanical gearbox have any different recommendations to the newer more electronically controlled gearboxes ? and what is the general opinion of these conflicting information’s?
 

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