MBRedux

Where do they stand? By next year, their entire line up will be DI. Yes, thus far they are "spot free". No, their trim levels are actually leaner than most DI applications.

r3dbullet89

It's probably going to be a more complicated tune than just a chip and C350 intake. I'm just hoping to see MPGs increase and lower 0-60 times.

MBRedux

You're right, it will. See post #8.

HunterKy

My understanding was that 2013 C300 & C350 are using exactly the same engine, just different size of rotation wheels?(axis?sorry that exact terminology is escaping my head right now...)
From what i remember, C300 has the smaller wheels whereas C350 got the bigger ones, hence the power increase...i might have the orders backwards but u get the idea.
Please correct me if i'm wrong.

the reasoning i got from the MB techs, was so they dont have to design 2 types of engines (and assembly lines) for 2 models that are essentially the same...all they had to do was just swapping out the wheels for a particular model.

again, please feel free to correct me if i'm wrong

kevink2

By wheels do you mean the size of the camshaft lobes?

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KGBSPY

If there are any questions I will do my best to answer. I have picked up 27 days ago my 2013 c300

HunterKy

I'm not quite sure...i got this piece of info when i was talking to my dealership salesman on our way to get my license plate changed ....so i didnt really pay attention....

LILBENZ230

Wheels? Like.. rims? The C-class has optional rims in the line-up. By this logic, you could simply put on a different size rim and have more or less power. Did a salesman tell you that?

HunterKy

No..i'm not talking about the rims, i was talking about the wheels in the engine. i would assume it's the wheels with the belts wrapped around. and yes a salesman told me this but he wasn't talking about rims either.

Gersh320

I've (wife) been driving my '13 for about 500 miles now. Do you foresee any issues with this new M276 engine and our crap quality gas here? I use Shell premium 98% of the time, but premium 100% of the time. My W211 has almost 126k and is still running perfectly using Shell. No filter change.

If there are going to be issues like in the Audi, I'm not going to purchase this car after my lease is up.

thanks,

C63newdude

I just sold my 2011 C300 for a 2013 Passat TDI. The Mercedes gas mileage was mediocre.

KGBSPY

Haha I had mine for only a month now and almost at 2000miles love the thing yes recommended is 91 octane but I have been issuing 90 there isn't much difference and I talked to the engineers and they said 90 is just fine. As far as which has station to get gas from Mercedes is not that picky. It is built to last. So as long as you use the right octane it will be just fine, all though yes shell and chevron are one of the best for fuel.

KGBSPY

Probably should change the filter though to manufacturers recommendations

Gersh320

You are not comparing apples to apples. Of course a 13 TDI will get better than an 11 GAS engine

kevink2

I don't think it shears down from a high 30W to a 20W, what is the source of shear? I'd say fuel dilution could more likely bring down the viscosity. edit: In fact, this is stated on your UOA report !!

That reads illogically. Good high flash point and trace amounts of fuel (all good). Why does this increase the probability of more valve caking? Do you mean good with port injection and "must be bad" with DI ?

May be true, but I thought MB could not run stratified mode in US because of poor fuel quality, and just tuned around it to compensate. That is, the tuning is not what you had in the Audi when the ecu ran a default mode when strat charge was disabeled due to poor gas, as I think you said.

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kevink2

Yup, I think I won the "find the answer" from Glyn regarding how MB solved the problem But a few questions:

1) does MB rotate the intake valve (offset contact @ top of valve stem), so all parts of the back of the valve get sprayed?

2) did MB modify the pvc/egr systems to prevent sludge build up in the intake manifold, or worst case in the head port?

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