auto gear change

[jay simpson]

made a post a few days ago but dont think i explained things correctly so i,ll try again i have a 97 c200 auto 139000 miles full service history in exellent condition but have noticed that going up hills even a slight hill it seems to stay in gear too long ie if it changes down to second it will stay there till at least 3000 rpm is this normal, on the flat it changes a1 it had a atf change but 30000 miles ago there is no bangs or noises from box and the s w switch all works fine anyone have any ideas for me , i did put a new radiator on it a few weeks ago and when changing it i noticed that the transmission fluid which leeked out a bit when removing the gearbox pipes was brown, i topped it back up using the correct dip stick and comma oil which was the oil reccomended in the book from the auto shop only put in half a litre ,to bring the level back up, although the car has been like this since ive owned it i just want to make sure everything is correct, please any information would be fantastic.

 

[BlackC55]

Are you sure that comma oil is ok?

 

[bennesspipers]

What does it say on the bottle ?

 

[jay simpson]

its what was listed in shop book

 

[jay simpson]

dextron 11

 

[alexander patie]

wrong oil, but will not do too much harm in small quantities. if you floor it, how much power do you have? failing maf sensors can give these symptoms as you need lots of throttle pedal to achieve the necessary power. the etc module hold gears to higher rpm on higher throttle angles.

if you briefly take your foot off then put back on again you may find it changes up.

 

[jay simpson]

yer loads of power kickdown works a1 does anyone think it could need a atf and filter change now as it was done 30000 miles ago and the fluid is brown

 

[jay simpson]

here is the comma spec i fhttp://commaoil.com/productsguide/vrmound for the oil

 

[alexander patie]

this would be the correct oil according to comma, but not recommended by MB.

Comma :: Productsguide

236.10 is the mb datasheet spec, comma claim to meet this.

 

[andymerc]

Have used comma before with no promlems if the oil looks brown/dirty no harm in doing an oil and filter change

 

[alexander patie]

the first oil would be fine for your 300te 4-matic andy, but the oils appropriate for the 722.6 gearboxes and above are a highly controversial subject, with most transmission specialist urging use of the correct grade. i have listed the correct comma oil, if their assertion of 236.10 spec is correct.

 

[lynall]

Gearbox place who rebuilt my box a few weeks ago reckons he only uses atf3 in everything and never has any problems at all ever.

But when warranty out i shall stick my stock of mb oil in it.

Atf2 is pretty crap low spec oil especially nowadays.



Lynall

 

[BlackC55]

ATFIII is not good enough really. I would do a change asap.

What I don't understand is why people don't just buy the correct oil from MB and use that? It is not that much more expensive but then you know its RIGHT for your 722.6 gearbox.

 

[andymerc]

the first oil would be fine for your 300te 4-matic andy, but the oils appropriate for the 722.6 gearboxes and above are a highly controversial subject, with most transmission specialist urging use of the correct grade. i have listed the correct comma oil, if their assertion of 236.10 spec is correct.

sorry i should have said that i have used the comma multi vehicle auto fluid which has the mb spec 236.6/7/10/12 in c class and a class .I have been told, I don't if its true or not that comma is part of mobil.

 

[alexander patie]

if comma claim 236.10 compatibility for their oil i have no reason to doubt it. the o/p in this thread has been advised the wrong oil though, i checked the comma on-line catalogue and found it is incorrect, listing atf-III for ALL w202 models.

 

[Neebo]

Is the oil def brown ? it should be red or if driven hard or been slipping poss a dark grey/black,
could it be milky i.e coolant in the 'box
I have never seen any oil book state anything other than a redirection to the Dealer ?

 

[jay simpson]

thanks everyone i,ll change the atf and filter shall have a look for instructions on how to

 

[AllanE]

...it should be red or if driven hard or been slipping poss a dark grey/black...

ATF shouldn't be dark/grey/black even if driven hard.
Once the gearbox has bedded in, clutch plate wear should be negligible unless there's a fault.
If the ATF's black that means a bewaring has died or a clutch has burnt - just slipping, i.e. not tied between gears (two clutches fighting each other) won't cause black ATF, either.
The same basic material that's on the clutch plates is also used in 'constant slip' applications - lock-up clutches are an example.