Clk 220 cdi manual gearbox

[Phonecbr1100]

I have a 2006 Clk 220 cdi with a 6 speed manual gearbox which when cold has a problem getting into reverse...just a bit stiff !. When warmed up it seems better.Having browsed t'internet , a lot of posts are about auto gearboxes atc.
How easy is it to change the gearbox oil , are any special tools required and would it be better for a local garage to do it.
Any preferred garage near Wellingborough , Northants ?

 

[saff]

It may not be the gearbox but clutch drag ie not disengaging properly. This may show up more as no synchromesh on reverse. I may be wrong but I dont think changing the oil would help. I'd seek professional input.

 

[Bellow]

.
How easy is it to change the gearbox oil , are any special tools required and would it be better for a local garage to do it.

Generally, tools required are: appropriate 'key' for plugs; drain receptacle; filling method.
Specific to your car I don't know anything else is required but the main variable car to car is access. If a lot of 'stuff' has to be removed first, then maybe better left to a garage (that can better deal with undertrays that hinge down).

Absolutely, remove the filler plug FIRST. Drain when warm.
In your case ( re cold engagement of reverse), take care to get the correct oil viscosity - consider the lowest if there is a choice.

 

[Ted]

Those boxes are known to be baulky/notchy when cold - my old slk was just the same - especially when cold
Apparently Redline MTL will cure or improve it.
Remember to remove the filler/level plug before the drain plug.

 

[Phonecbr1100]

Those boxes are known to be baulky/notchy when cold - my old slk was just the same - especially when cold
Apparently Redline MTL will cure or improve it.
Remember to remove the filler/level plug before the drain plug.

Thanks for that. It's what I thought.
I think I will try HA Lock in Rushden , heard good things about him. I would do it myself but no ramps and can't be bothered!...my days of scrabbling underneath cars are waning fast

 

[190]

When you look at MB's recommendations for manual gearbox oil the standard spec is 235.10 but there is a special thin oil 235.3 described as ServiceKit NSG for MBC (NSG270/ NSG400) ServiceKit = for cold shiftability.

Finding it outside of a main dealer will be near impossible though. In terms of viscosity the only match I've seen is Castrol Syntrans FE 75W which is 6.3 cSt at 100 Deg C and 32.2 cSt at 40 Deg C. This is very thin oil on par with ATF and the 235.10 oil is not much thicker. I wouldn't use anything else without comparing the viscosity specs. Forget anything like the usual 75W90 gear oil which is grossly too thick and completely unsuitable.