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SLK R172 General Discussion Discussion regarding the Mercedes SLK R172

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#21 Old 05-01-2019
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Originally Posted by Avel Du View Post
350 171 is an oddball.
We discovered whilst touring that our 350 does not like 95.
It's ok for a top up, but a tank full brought on EML.
Fixed with a full tank of higher octane.

Over the last 3 years I have chatted to many 350 owners.
Some only ever use 95 and without issue.
A few only use higher rated fuel because they had an issue with regular.

The post facelift seems to be the one that suffers the issue.
This isn't uncommon. Higher compression engines need the higher octane. Throwing too high octane fuel at a car can hurt things like catalytic converters and just isn't necessary. People that ignore what the engineers have suggested for fuel are being foolish. They're the ones that designed the engine and have designed it in a way that needs or doesn't need higher octane fuel.
Ethanol is only about making profits for corn farmers etc. Ask an honest, educated corn farmer and they'll tell you the real story. Ethanol costs consumers millions every year between small engine repairs and the mpg loss. It's only a filler. Do you like to pay for filler in your food? Me neither. Same goes for fuel.
Look up the story about "CIA Agent" Beal at the EPA. He's one of the ones, if not THE one that came up with this crap. He should still be rotting in prison, but he got out in 2016.
https://en.wikipedia.org/wiki/John_C._Beale
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#22 Old 05-01-2019
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Refiners have always thrown cheap product into fuels and then brought the number back with additives.

Lead being the most obvious.

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#23 Old 05-01-2019
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Originally Posted by Avel Du View Post
Refiners have always thrown cheap product into fuels and then brought the number back with additives.

Lead being the most obvious.
This is true, but in the case of lead it helped your valve train. It cushioned your valves. What does ethanol do? It rots hoses, becomes gel and eventually hardens if left for a couple of months in many cases.
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#24 Old 05-01-2019
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Originally Posted by HawkX66 View Post
This is true, but in the case of lead it helped your valve train. It cushioned your valves. What does ethanol do? It rots hoses, becomes gel and eventually hardens if left for a couple of months in many cases.
True, but engine manufactures got away with cheaper, soft valve seats.
Caused chaos when they switched.

Those running lawnmowers on 5 star made me chuckle.

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#25 Old 05-01-2019
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Originally Posted by Avel Du View Post
True, but engine manufactures got away with cheaper, soft valve seats.
Caused chaos when they switched.

Those running lawnmowers on 5 star made me chuckle.
It still causes problems all the time in the world of collector cars. In a lot of cases now you can't even find a machine shop who will replace valve seats with hardened ones.
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#26 Old 05-01-2019
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Originally Posted by HawkX66 View Post
This isn't uncommon. Higher compression engines need the higher octane. Throwing too high octane fuel at a car can hurt things like catalytic converters and just isn't necessary. People that ignore what the engineers have suggested for fuel are being foolish. They're the ones that designed the engine and have designed it in a way that needs or doesn't need higher octane fuel.
Ethanol is only about making profits for corn farmers etc. Ask an honest, educated corn farmer and they'll tell you the real story. Ethanol costs consumers millions every year between small engine repairs and the mpg loss. It's only a filler. Do you like to pay for filler in your food? Me neither. Same goes for fuel.
Look up the story about "CIA Agent" Beal at the EPA. He's one of the ones, if not THE one that came up with this crap. He should still be rotting in prison, but he got out in 2016.
https://en.wikipedia.org/wiki/John_C._Beale
Very informative post, @HawkX66. Many thanks for this. From here forward, I will do a good read-out on any gasoline pump 91/93/95 PON that I will be filling in my car to make sure there are no Ethanol additive for that station. BTW, does anyone know which oil refiner is most notorious for adding EtOH (aka ethanol ) to their gasoline at the pump, or is this more of a regional location issue. I am based out east - Boston, MA to be exact. Can't say I have ever paid any attention until now, but I will now...
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#27 Old 05-01-2019
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Originally Posted by b82012 View Post
BTW, does anyone know which oil refiner is most notorious for adding EtOH (aka ethanol ) to their gasoline at the pump, or is this more of a regional location issue. I am based out east - Boston, MA to be exact. Can't say I have ever paid any attention until now, but I will now...
Must have missed my post Omo
https://www.slkworld.com/4527788-post15.html

Most of those posters are correct but a lot aren't. You still need to check the pump (or even ask the attendant to check their delivery sheets. It will say if there's ethanol or not in their premium offering).
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#28 Old 05-01-2019
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Originally Posted by LeonardoDaBenz View Post
Must have missed my post Omo
https://www.slkworld.com/4527788-post15.html

Most of those posters are correct but a lot aren't. You still need to check the pump (or even ask the attendant to check their delivery sheets. It will say if there's ethanol or not in their premium offering).
Many thanks, Len. Looking at that link, I find quite a few within a short (<15 miles) drive from my home claiming to run EtOH-free gasoline at their pumps. I shall be checking these out to verify this in person shortly. Will report my findings if these are indeed correct as advertised/claimed.

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#29 Old 05-01-2019
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If they aren't, you can edit the specific post in that link to correct it. I think you can even delete somone elses post if incorrect.
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#30 Old 05-01-2019
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Originally Posted by b82012 View Post
Very informative post, @HawkX66. Many thanks for this. From here forward, I will do a good read-out on any gasoline pump 91/93/95 PON that I will be filling in my car to make sure there are no Ethanol additive for that station. BTW, does anyone know which oil refiner is most notorious for adding EtOH (aka ethanol ) to their gasoline at the pump, or is this more of a regional location issue. I am based out east - Boston, MA to be exact. Can't say I have ever paid any attention until now, but I will now...
Glad I could help. I was born and raised not far from you. I think you've already gotten better help than I can give you regarding finding ethanol free gas near you. Maybe near the tanks in Dorchester? Unfortunately all fuel companies/gas stations use it now. It usually costs more when you do find a station that offers "the good stuff." Sometimes it's a single pump away from the others and sometimes it's just a separate nozzle like diesel. I don't use it because I haven't seen it above 89 octane and it really doesn't seem to cause many issues in daily drivers because you're constantly moving the fuel through the system. I only run super (91-93 octane) in my car.
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#31 Old 05-02-2019
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I have noticed in my area, almost every station, as of very recently, has begun to offer a pump of ethanol-free. It was rarer before. The reason seems to be that almost 1 in 4 here own a boat. Outboard motors HATE ethanol. Mainly because, as pointed out by another poster, a boat sits longer between uses and can gel up, etc. cars don’t seem to matter as much if they are used frequently. 25% of all U.S. gasoline is refined here in Baton Rouge, so perhaps it is easier to come by here.
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