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post #1 of 9 (permalink) Old 01-03-2019, 10:32 PM Thread Starter
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Fuel type

Does everyone use 91 Octane /premium fuel in their GLK350, or does 87 octane cause any problems?
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post #2 of 9 (permalink) Old 01-03-2019, 11:07 PM
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RTFM....
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post #3 of 9 (permalink) Old 01-06-2019, 10:32 AM
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Quote:
Originally Posted by flymetom View Post
Does everyone use 91 Octane /premium fuel in their GLK350, or does 87 octane cause any problems?
Hi,


There are many threads on this subject. You may do a search in Benzworld.org... most of car chronicors will tell you to use the recommended Octane for your car/suv's. There are many reasons why to do so such engine performance, having the right catalytic converter temperature, etc.

For the low money difference, you should stick with the 91 Octane fuel...
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post #4 of 9 (permalink) Old 02-17-2019, 03:46 PM
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If you drive it like an old lady - that is, light throttle and never hit passing gear - odds are great you won't encounter any issues. If you do any type of spirited driving, including passing gear, a lower octane rating will cause the engine computer to retard ignition timing, resulting in a hit in power output in an effort to save the engine from pre-ignition. The problem is, it can only retard the ignition timing so much, and if it can't retard it enough, you can seriously damage the engine, mainly melted pistons and/or burned valves and seats. A repair bill for such damage can easily reach ~$7,000 to rebuild - provided you can find the parts - or more than half that with an engine sourced from a scrap yard. Unless you can legitimately save $7,000 in gas prices, it really isn't worth it. There are, however, plenty of choices of vehicles from manufacturers such as General Motors, Ford Motor Company, Fiat/Chrysler, Honda, Toyota, Hyundai, Kia etc. that don't require 91 octane.
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post #5 of 9 (permalink) Old 02-17-2019, 04:05 PM
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LOL..........this question comes up quite often. Apparently there are a lot of people who can afford to buy a Benz, but not the required gas to put in it
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post #6 of 9 (permalink) Old 02-19-2019, 05:58 AM Thread Starter
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I can see this is a sensitive subject. I do thank those that provided useful feedback. My initial search did not yield any results. I was however, looking for practical/actual experience in this matter. Being budget minded, $15 difference on each fill is significant. ( Granted, not as significant as an engine rebuild, so premium it is!)
Tom
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post #7 of 9 (permalink) Old 02-19-2019, 08:14 AM
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Originally Posted by flymetom View Post
I can see this is a sensitive subject. I do thank those that provided useful feedback. My initial search did not yield any results. I was however, looking for practical/actual experience in this matter. Being budget minded, $15 difference on each fill is significant. ( Granted, not as significant as an engine rebuild, so premium it is!)
Tom

WOW..........$15 dollar difference??? That's a big spread!!! No wonder you asked.

The spread is only 15 to 30 cent where I live. About $2.40 to $4.50 more for a 15 gallon fill up.
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post #8 of 9 (permalink) Old 02-23-2019, 06:57 PM
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Run premium. If a extra $15 or so hurts your wallet then you purchased the wrong car... Skip the Starbucks or Dunkin everyday and run premium. The engine will thank you for it. The other thing to keep in mind is if something goes wrong God forbid.... And MB finds out you did not use the proper fuel then they will not help you at all because you failed to use the correct fuel. Same goes with lack of upkeep as well.
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post #9 of 9 (permalink) Old 02-23-2019, 07:11 PM
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Quote:
Originally Posted by flymetom View Post
I can see this is a sensitive subject. I do thank those that provided useful feedback. My initial search did not yield any results. I was however, looking for practical/actual experience in this matter. Being budget minded, $15 difference on each fill is significant. ( Granted, not as significant as an engine rebuild, so premium it is!)
Tom
You don't have an owner's manual?


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