AgSilver

Just changed the S/C oil at 63,000 miles.

Interesting observation: It required almost three times the amount of new oil than the amount drained. I know these units are sealed, but is it possible small amounts of oil are consumed over time?

The old oil smelled pretty bad (as has been noted in other posts) and the new oil (Mobil Jet) had a normal order of synthetic oil. I have had jet turbine aircraft which use the same oil. I do not recall the used turbine oil smelling so bad. I didn't think of it at the time, but I should have sent a sample off to be analysed. Perhaps a forum member can do that in the future. I would be interested to see the results, especially pertaining to the condition of the oil.

berti_00

Did you fill it on the car or off??? If you overfilled it your going to start shooting it from the sc pulley, while spinning on the hood...

Hulk

Has anyone seen a diff by changing the oil?

1970gsx

Maybe it was changed before and someone used gear lube instead? Thats the only oil I can think of that smells like crap.

Hulk

Many who have changed it say the same
Smells very bad

berti_00

Am sure there is.. maybe not something we can physically notice but its nice to do it

Shifter

If you fill it back up till it runs out the hole it is overfull , that's why u only got less out. I didn't get much out either, and filled it with the factory fill 125ml

Manuyc

AgSilver

Good point. I was not aware of the 125ml (4.23oz) capacity. However, it took exactly 6 injections from a 20cc syringe (1cc=1ml) + 5cc at which point the oil was beginning to run out of the filler hole. I seem to recall another post which indicated the S/C should be filled to the filler hole (similar to filling a differential). This is what I did with the S/C perfectly level in the car. So, it would seem that the filler hole is also the oil level reference point. There's about 60 miles since the refill and no leakage whatsoever.

Therefore, getting back to my original question; do these blowers consume oil over time? It would seem to me that they do, or at least mine does. My oil level would appear to have been down about 50% as I could not extract more than 3 syringes of oil.

Any additional thoughts on this?

Exotic-metal55

Mine was low as well and it must evaporate out or just slow leak .

AgSilver

No doubt. Yet I am unaware of any service requirement from MB. Accordingly, I would say it is then reasonable to believe (assumption is the mother of all F-Up's) that these blowers are at risk of failing due to oil depletion and or oil breakdown.

Again, I really wish I had sent a sample to the lab for analysis. Hopefully, one of the forum members will eventually do so.

FASN8N

I have not changed my SC oil yet and will send it off to Blackstone Labs (when I get around to changing it) for analysis just like I do for all my engine oil.

slownrusty

Something does not make sense and the oil does not evaporate, for it evaporate would require that it boils and an internal combustion engine would melt long before the boiling point of oil is ever reached. The only way it would require continual re-fills would be via a leak.

The factory capacity is exactly 125ml which I verified a few weekends ago.

ArmoE55

How often is it recommended to change the blower oil? Currently, I am a tick over 40K miles ...

slownrusty

You are due.

StuttgartAMG

The IHI SC of the 55k-engines need 150ml of Mobil Jet ooil II.
It is impossible to evacuate all of the oil without stripping the SC!
Mobil JO II is a turbine oil to work up to 240°C. I our cars it will only be exposed to abou 100°C. So there will be no measurable oil consumption.

If you change the SC oil, just fill up as much as you took out.

vaiste001

This is correct. Mobil Jet Oil II or 254 and for the M113K 150 ml.

Oil with part number 000 989 62 01 is used for Eaton type supercharger found on M271 engines. The reason for Mercedes service to give this oil when asked about supercharger oil is that this is the only oil they have listed as supercharger oil.

IHI twinscrew superchargers don't need supercharger oil change (according to Mercedes). If oil has to been added then the supercharger is threated as a faulty unit.

Despite the Mercedes recommendation SC oil can be changed. Or do you think there is an oil that keeps its lubricating qualities for a lifetime?

djrabbi

I am at 103k, don't think it has been ever changed lol.

any one have an extra bottle???

AgSilver

As I previously posted, that's what was required to bring the oil to the filler hole.

Mobil Jet Oil has an evaporation loss of of 3% in 6.5 hr @ 204ºC, 29.5" Hg (sea level). So, we know the blowers operate below 204ºC, but over a 7-9 year period, I do not think it unreasonable that there will be loss due to evaporation at our lower operating temps.

This stuff is a pretty exotic blend with new oil having a fresh scent and you know what the used stuff smells like (YUK!). I believe that to be significant.

Forrest Gump 9

Well, I had a pleasure of open an sc up once. Iirc, there are two holes/tubes that run along the sc body. The holes/tubes run from the sc nose back to the sc inlet. May be some of the oil escape thru the holes/tubes?

StuttgartAMG

The smell is ugly because of the bimstone/sulfur (don't know with word is right).
This oil has a lot of antioxidants. Over about 10 years you loose about 10% of them.

Additionally you have a special filter in the clutch to condense the hot oil.

And our S/C gear works in about 100°C peak(!!!), not 200°C!

So I'm not worried to have a lifetime filling.

AgSilver

Having owned several turbine aircraft, I will tell you that turbine engine oil operates at about the same temps and there are strict requirements when to replace the oil. Even at 100°C, there will be evaporation and deterioration of the lubricating quality of the oil. Now, that said, if you choose not to question authority, the authority in this case being Mercedes Benz, that's certainly your decision. However, I would remind you that Mercedes Benz originally stated that the 722 transmissions had a lifetime filling and required no service. Of course, all that changed with the massive number of catastrophic failures due to oil break down. So, now it's a regular service at 40k miles - - - hardly a lifetime would you say? Personally, I prefer 15k miles.

So, are you still not worried about having a lifetime filling?

Back to not questioning authority, that resulted in terrible times for the entire world about 75 years ago. If it's a red light and there is no car in sight do you wait for the green light to cross the street?

Was denken Sie?

P.S. Ich lebe in Neiderheimbach für ca. 6 Monate im Jahr.

AgSilver

Perhaps the question should be; has anyone experienced a S/C failure?