MrGreedy
MB Enthusiast
This is more of a brief how to than anything else. Learned a few things that will help anyone wanting to try this.
It was a pleasant 7⁰C this evening, so positively tropical to be doing this on the drive in the light drizzle

New reservoir was £48 inc VAT from local dealer. Had to order it in so took a couple of days.
PAS fluid is Merc 345.0, which I suspect is just Fuchs Pentosin CHF 11 in a Merc bottle. Opie oils was cheapest. I suggest 3L.
Other things needed:
- Torx star bits to remove air filter.
- E10 torx socket.
- Junior hacksaw/blade.
- 15-17mm fuel hose clamp.
- Angled hose clamp pliers (you can manage with a very small pair of mole grips, but it will take you forever due to lack of space and you will wish you had spent £8 on some angled hose clamp pliers.
- a couple of empty 4 pints plastic milk bottles.
- an empty bean/soup etc can.
- 10mm ID silicon tubing and a 10mm OD small piece of plastic tubing.
- assorted small zip ties.
Remove engine cover.
Unclip the batwing on the passenger side and remove the air filter.
Using E10 torx socket remove bolts from the air box and remove all the passenger side air box pipework to create more room.
For the return fluid pipe at the front of the PAS reservoir, you need to get the metal clip off. For me, the access to undo the clip was underneath the pipe with little access. I didn't mess about and started to cut through the securing nobble on the clip with a junior hacksaw. Rags underneath to catch swarf. It didn't put up much of a fight and soon popped off. On reassembly, I used the 15-17mm fuel hose clamp, which went back of easy and is a breeze to tighten and remove again should that ever be required.
Put the empty can under the return pipe inlet for the PAS reservoir, the one you've just removed the clip from.
Pull the pipe off (it comes off very easily, and let everything drain out of the reservoir and the pipe you've just disconnected into the conveniently positioned can. It lodges perfectly in place

It was a pleasant 7⁰C this evening, so positively tropical to be doing this on the drive in the light drizzle

New reservoir was £48 inc VAT from local dealer. Had to order it in so took a couple of days.
PAS fluid is Merc 345.0, which I suspect is just Fuchs Pentosin CHF 11 in a Merc bottle. Opie oils was cheapest. I suggest 3L.
Mercedes-Benz Operating Fluids
Publication platform for approved operating fluids from Mercedes-Benz
operatingfluids.mercedes-benz.com
Other things needed:
- Torx star bits to remove air filter.
- E10 torx socket.
- Junior hacksaw/blade.
- 15-17mm fuel hose clamp.
- Angled hose clamp pliers (you can manage with a very small pair of mole grips, but it will take you forever due to lack of space and you will wish you had spent £8 on some angled hose clamp pliers.
- a couple of empty 4 pints plastic milk bottles.
- an empty bean/soup etc can.
- 10mm ID silicon tubing and a 10mm OD small piece of plastic tubing.
- assorted small zip ties.
Remove engine cover.
Unclip the batwing on the passenger side and remove the air filter.
Using E10 torx socket remove bolts from the air box and remove all the passenger side air box pipework to create more room.
For the return fluid pipe at the front of the PAS reservoir, you need to get the metal clip off. For me, the access to undo the clip was underneath the pipe with little access. I didn't mess about and started to cut through the securing nobble on the clip with a junior hacksaw. Rags underneath to catch swarf. It didn't put up much of a fight and soon popped off. On reassembly, I used the 15-17mm fuel hose clamp, which went back of easy and is a breeze to tighten and remove again should that ever be required.
Put the empty can under the return pipe inlet for the PAS reservoir, the one you've just removed the clip from.
Pull the pipe off (it comes off very easily, and let everything drain out of the reservoir and the pipe you've just disconnected into the conveniently positioned can. It lodges perfectly in place

