Nah, that's not gonna do it. Initially, I didn't want to respond to you because you're so incredibly incorrect, that I didn't want to embarrass you in public. I might have educated you given the right response, but since you're clearly a juvenile, I'm going to wait until you grow up.

Until then, maybe you can embarrass yourself further by explaining to us how knock sensors work? You clearly believe that monitoring 8 cylinders requires 8 knock sensors? (Note, I'm giving you a hint as to where you should start in educating yourself.)

 

Hey Ignatius,

Well, that apparently did do it, as you have posted yet another childish response along the lines of "I know you are but what am I?" instead of proving you have any technical knowledge whatsoever.

Get back to me once you figure out what a spark plug is.

 

Aren't there octane/engine/spark plug forums forums out there?

 

Once someone in the other thread told jsap how many spark plugs his engine had, that part of the discussion was taken care of:

https://mbworld.org/forums/sl-class-...do-i-have.html

Tragic that he couldn't figure that one out by himself.

 

some cars have 2 some have 1 per cylinder

 

You need to try harder. Maybe by looking at your own post?

Well, so people don't become misinformed, I better post the correct information somewhere. There's nothing worse than the propagation of misinformation just because someone is louder. But, since this person is still a kid, I don't want to bother him with such things, since he's busy polishing his smurfs. I'll let some of you know where I've placed the info, except the kid.

 

Exactly how ancient, decrepit, and coprolitic are you?

Turn down your hearing aid. Pop a couple of Geritols. Turn off the Lawrence Welk, get out your walker, put some fresh tennis ***** on it, and go out and get some fresh air!

Most importantly of all, take a break from Internet trolling.

(Did your old-folks home just get the Interweb on one of them new-fangled TV-like doo-hickies (that gets the Internets in COLOR?!?!) 'cause you're coming across as a rank noob who just got on-line in his retirement.)




(Not that there's anything wrong with growing older; we all are.)

 

Note: a coprolite is fossilized dinosaur poo.

 

Oh, you really ARE a kid! That's cute. I heard shrek 4 came out recently. And Toy Story 3. This year must have been the bestest year for you! Evuuur!

Btw, this last post wasn't as good. You've done better.

 

Poor OLD (j)sap! Having to deal with all of those young whipper-snappers under the age of 60 on them-thar Internets!

From the Merriam-Webster definition of sap:

1. ...a watery solution...

2. a foolish gullible person

 

Apologies to you, and to everyone who had to read through this. Let's go back to discussing the GLK.

 

This discussion started out somewhat amusing with some good technical information. Now, it's all downhill with the bickering guys, and is quite vaginal. If someone has some more useful information, please post it. At the end of the day, like I said earlier use the recommended gas you car needs. I really don't see why the debate on gas keeps coming up in regards to MB's. I smell a lock coming if the insults keep going.

JMT...

 

So, how do knock sensors work on the GLK? I'm here to learn from you.

 

BigBen320E:

Agreed. Thanks for being the voice of reason.

I apologized to him and everyone else.

I consider it closed, even if it doesn't get locked. I won't respond any more.

 

Please do post the information you promised on how the knock sensor works on the GLK's engine.

I mean that in a friendly way, since I do want to get the discussion back onto technical topics.

 

First, let's tone down the name-calling and derrogatory comments. It's not called for here.



Second, My C320 has the 3.2L V6 (the predecessor of the 3.5L in your GLKs). The car has 79,000 miles on it. The first 5 years, I ran it on Premium, exclusively. The last 4.5 years it has run on Midgrade, exclusively. Midgrade here is 89 octane. I buy no-name gasoline.

I noticed a slight decrease in peppiness, initially (a month or so as the computer ECU adjusted), none since. No stutters, no preignition, nothing. Acceleration is just as good as before. And I do have my share of speeding tickets to prove I'm no grandpa on the gas pedal.

The engine definitely does NOT like regular unleaded (87 octane).

In May, I put 2000 miles on the car on a round trip from Dallas to Sierra Vista AZ and back. 70-75mph at 2850rpm for 14 hours continuously each way. Upon returning, I have noticed my gas mileage has increased about 1.5mpg, and is holding at this level in the 3 months since. The point is that highway driving for hours on end using midgrade fuel in no way harmed the engine, and in fact appears to have improved it.

In fact, my gas mileage has gradually increased throughout the life of the car, regardless of gasoline octane. I get about 23-25mpg in mixed city/hwy driving... 30mpg on the interstate exclusively. My best Interstate mileage was 33mpg, when ambient temp conditions are perfect (70º or so, low humidity). IMO, ambient temperature has more affect on this engine's performance than choice between the two upper grades of fuel.

I attribute the gradual increase in fuel economy to the exclusive use of Mobil 1, 0-40w fully synthetic oil. I'm told this lubricant delays a full break-in with the engine. I change it once a year, regardless of mileage.

After spending almost 10 years with this car, I've concluded there is no benefit in running Premium fuel in this engine, nor any harm in running 89 octane. I occassionally visit 3rd world countries where I see a Mercedes pass and I wonder where that fellow finds Premium gas (knowing there is none).

Of course, my car is long since out of warranty, so it's my choice to run Midgrade in it. But the engine continues to be bullet proof. The choice is yours...

 

Again, my apologies to jsap and everyone else for engaging in the flame war, and apologies for bringing the sport (i.e.- this forum) into disrepute (as they say in F1).

 

Well, like I said, I've been in some ridiculous online conversations lately, and this one certainly adds to the list.

Why these octane conversations get out of hand, who knows. Assuming that we have indeed cooled off, I'll post a few items on knock sensor operation on the M119.97x engine equipped with the EZL/LH ICU.

I won't address every item that have come across this thread, because at some point we deviated from the basic discussion. And, actually, the knock sensor discussion, is also a side-bar subject to the main subject matter: Mercedes being the only manufacturer of knock-sensor equipped vehicles to tell its consumers that their cars needs to be at less than 2000 RPM, despite the fact that Lexus and BMW make 12+:1 ratio engines and can safely run on lower octane. And we're supposed to believe that this is because Mercedes are so very special, and that makes US so very special, and therefore our gas NEEDS to be so very specially 91 octane....

Every engine is different, but the basic operation of anti-knock is the same.

I'll use primary documentation for this so we can get past playing this game of who's the real idiot. Hopefully, we can get past the basics, and have higher level discussions.

Btw, I hope you believe me that I was serious when I said that this would be laborious....

 

Attachments continued.

 

Gas is crazy high in California so I use the “middle grade” on occasions but I prefer premium…at the end of the day they r basically the same…I do not see a difference in the two…*shrugs*

 

91 octane is $4.03 a gallon here on Maui. 87 octane is $3.83 a gallon, the higher it is the lower the percent difference between regular and premium

 

WOW

 

Gas is pretty pricey here in CA.

I just got back from Nashville where regular was as low as $2.59 a gallon.

Good barbeque, too...

 

I just filled up here on Maui, Shell Premium was $3.96 per gallon. Regular runs around 15 cents less so at these prices who cares about saving 15 cents.

 

This "I wanna use cheap gas so I'm gonna ask until I get enough yes votes" mentality is on every forum on this site

I pity the fool who buys one of these cars from one of these "wanna be a baller but can't afford the right gas types"

What about routine maintenance? Where else are the corners cut?