Why no 91 Octane available? - Page 3 - Mercedes-Benz Forum

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post #21 of 38 (permalink) Old 01-24-2007, 06:48 AM
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Originally Posted by Musikmann
Now I have one for you (fellow old timer): Did you follow the common wisdom at the time and only change your oil filter at every other oil change? Haha, I think we all did it here, and what a stupid thing that was. BUT, in my 1991 Camry owner's manual, it says to do exactly that: change oil every 3750 and the filter every 7500. Perhaps it's needless to say that I have ignored that, and change both every 3000.
You don't have to be an old timer for that. The CURRENT Boxster, 911, and Caymen maintenence schedules call for an oil change every 15,000 miles, and a filter change every 30,000.
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post #22 of 38 (permalink) Old 01-24-2007, 08:54 AM
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Question Porsche oil change protocol

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Originally Posted by MarcusF
You don't have to be an old timer for that. The CURRENT Boxster, 911, and Caymen maintenence schedules call for an oil change every 15,000 miles, and a filter change every 30,000.
That's stretching the "low maintenace" idea just a bit don't you think? That surprises me, but who am I to argue with the Porsche engineers? I suppose that's one helluva filter they're using.

I remember back when I had my couple of '70s era 911s that they required a "double diaphragm" oil filter that cost about 3x what a Fram did then. Do you remember what the recommended oil intervals were then Marcus?

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post #23 of 38 (permalink) Old 01-24-2007, 09:06 AM
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I don't remember the factory interval, but I remember mine - a case of 20/50 every 3,000 miles.
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post #24 of 38 (permalink) Old 01-24-2007, 09:34 AM
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Question Multi-viscosity

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I don't remember the factory interval, but I remember mine - a case of 20/50 every 3,000 miles.
That's odd, or maybe it isn't. I had a 1972 911T (bought from my father who bought it new) and a 1976 911 Targa (bought used from a guy I barely knew, but was in the import car business).

The 911T called for straight weight oil, and they told us in the manual if the temps go below 'such and such' to use 20W, if higher 30W, and then 40W. I don't think they recommended 10W under any circumstances. I have no recollection about the '76 Targa, but multi-vis was probably what they suggested by then.

As that 1972 car began to use oil, I upped the recommended weights a notch but I was never using as much as you were. However, with both of those fun cars, I was told they needed major engine work at close to 75,000 miles.

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post #25 of 38 (permalink) Old 01-24-2007, 04:22 PM
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All stations have 91 octane here in Toronto, and some have 93 octane (10% ethanol). I have tried both, and I haven't noticed any driving differences with either. What I did notice, however, is that 93 seems to finish quicker than 91 octane - I am getting about 40-60 miles less on a tank of 93 than on 91.

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post #26 of 38 (permalink) Old 01-24-2007, 04:56 PM
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All stations have 91 octane here in Toronto, and some have 93 octane (10% ethanol). I have tried both, and I haven't noticed any driving differences with either. What I did notice, however, is that 93 seems to finish quicker than 91 octane - I am getting about 40-60 miles less on a tank of 93 than on 91.
Let me guess...only the 93 has the ethanol in it?
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post #27 of 38 (permalink) Old 01-24-2007, 05:05 PM
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91 versus 93 octane

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Let me guess...only the 93 has the ethanol in it?
Ditto, that's what I also think he was implying. Ethanol-containing gasoline, although popular with the tree-hugger types, burns producing fewer BTUs; therefore your gas mileage will suffer. Plus, I don't think your engine is providing quite as much HP and torque using it.

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post #28 of 38 (permalink) Old 01-24-2007, 06:27 PM
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Let me guess...only the 93 has the ethanol in it?
That's what I suspected... The only confusing thing is that when I try the 91 octane with 10% ethanol versus 91 octane with no ethanol - I get about the same mileage. But with 93 (which only comes with 10% ethanol in my area), I get worse mileage numbers... I think I am going to stop experimenting with different gas types and just stick to the same pure 91 octane.

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post #29 of 38 (permalink) Old 01-24-2007, 06:41 PM
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Are you sure both the 91 and 93 are 10%, or 10% or more? BTW, octane numbers and ethanol percentages are all fairly approximate. But, ethanol is used as an octane booster (octane and power are different things). You want higher octane? Put in more ethanol...sure you'll get less mpg and less power, but ethanol is a cheap way to boost octane and people think more octane always equals better.

It's funny that ethanol is popular among tree huggers (and I agree that it is). More NOx output, more evaporative emissions, sometimes more HC emissions, is corrosive to rubber which will lead to more emissions in the future (since people will surely keep their cars running less than perfect rather than replace the seals).
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post #30 of 38 (permalink) Old 01-24-2007, 06:58 PM
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You are right, I think it is marked as 'up to 10%' ethanol, so it may be the case that the 91 are similar in both cases, whereas the 93 is more diluted.

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