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I've been a member of the Mercedes-Benz Club of America (as well as the VCoA), and our local club sponsors Tech Sessions with official MB Service Reps (the regional experts).
One such time we had a Q&A session with MB's regional fuel system expert. He told us that MB had experienced a large number of owner complaints -- and the cause stemmed from cars being fueled with cut-rate brand or "discount" gas stations. He said that 95% of fuel system component failures, premature wear, etc., stems from using such fuel that lack adequate additive packages. He said it pays in the long run to stick to the name brands -- in this area (the northeast) he said that Exxon and Shell and Amoco (more on Amoco later, though) had the best packages -- despite their higher prices; and he also told us that MB had found (they do analyses on all gasoline brands, in order to deal with customer complaints) that premium grades of gas not only had higher octane but also more or better (=more expensive) additive packages than lower grades.
A warning about AMOCO, however. I've seen on my local Amoco pumps that they're now all sporting a little label saying that they now contain 10% ethanol (probably a substitute for MBTE, a big environmental problem). I'm not anti-environment (I'm actually strongly pro), but I don't like ethanol in my gasoline right now because there have been a lot of reports stating that ethanol and MBTE, when mixed, react to form a gummy deposit (for the record, I'd rather have neither). To my mind, either all gasoline nationwide should be one or another or nothing at all. To have a mix like this in the consumer market is problematic -- folks stopping at different stations, or traveling, are apt to face this dilemma. I've thus sworn off Amoco -- a personal choice,
However, speaking of additives, I've heard (since gas prices have been zooming up this past year or so) that oil companies have been cutting back on their additive packages to keep their costs (i.e., their prices) down and remain competitive. So to combat this, I've been adding some name-brand substitutes. Not the Techron that someone recommended every 3,000 miles....
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With that Techron, you have to change your oil (and filter) right after using it, as in contaminates your oil, too (you'll see it turn pink!). Because I use expensive synthetic oil, I use longer oil changes and don't want to change it prematurely.
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... but types that I can put in every tankfull. I use Snap-On fuel injection cleaner and STP gas treatment (but you can use others as well). BTW, the Snap-On cleaner was selected because it says that it will clean the injectors, which I interpret as doing more than STP's counterpart fuel injection cleaner (which I don't use -- but not to be confused with STP gas treatment, which I do) because the latter only says that it will prevent deposits, a less rigorous claim.
On another note, someone answering you remarked on using regular gas (he only adds premium every 4th tankful). There is another consideration (penny-wise and pound foolish)....
We've all heard suggestions from so-called consumer experts to always use the lowest grade of gas that your car will run on, because using a higher grade gas is a total waste. But is it? That does not take into consideration knock sensors. You have a 940 turbo (B230FT-L?), and if it's anything like the red-blocks I know from the 240's, it's got a knock sensor. That means that you CAN run on mid-grade gas, maybe even regular-grade if you live where there aren't any hills. But what is happening is that your knock sensor is holding back ignition advance -- and this will cut back not only on power but also on fuel mileage. Lots of 240 turbo owners (on the 200 website) report better gas mileage with premium -- in fact, on a cost basis, their mileage improves to a point where they spend less on gas overall than when they tried lower grade gas. You might want to try that.
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