First Time MB Owner - FUEL question - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 11-27-2006, 01:23 PM Thread Starter
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First Time MB Owner - FUEL question

Just purchased a 2006 MB C280 with 8,000 from the dealer. It was their loaner car. I'm a driver who drives 7500 miles a year.
My questions is regarding fuel.
How important is it to use premium fuel only?
Is it OK to fuel up with regular unleaded once in awhile?
I had a BMW 325xi and used regular unleaded, Infiniti G35 same thing-never noticed a difference. I just keep reading to use premium fuel only - would this disrupt my warranties or something?
Plus-honestly-how do I know if this car hasn't been fueld with regualar unleaded since it's in service date? even with leased vehicles?
That is why I'm a bit confused.
Any help would be greatly appreciated.
(Please no answers like - why would you do this to a benz? why purchase if your concerned about gas?) I'm being for real-this is my first benz-and really want to know.
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post #2 of 8 (permalink) Old 11-27-2006, 01:39 PM
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Premium fuel does work better, but the engine has sensors to retard ignition, I think they want to use Ron 91 but premiunm is 93 and mid grade is 89. To tell the truth I use Mid-grade most of the time and once in a while go to Premium.
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post #3 of 8 (permalink) Old 11-27-2006, 01:54 PM
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Quote:
Originally Posted by deekny
Just purchased a 2006 MB C280 with 8,000 from the dealer. It was their loaner car. I'm a driver who drives 7500 miles a year.
My questions is regarding fuel.
How important is it to use premium fuel only?
Is it OK to fuel up with regular unleaded once in awhile?
I had a BMW 325xi and used regular unleaded, Infiniti G35 same thing-never noticed a difference. I just keep reading to use premium fuel only - would this disrupt my warranties or something?
Plus-honestly-how do I know if this car hasn't been fueld with regualar unleaded since it's in service date? even with leased vehicles?
That is why I'm a bit confused.
Any help would be greatly appreciated.
(Please no answers like - why would you do this to a benz? why purchase if your concerned about gas?) I'm being for real-this is my first benz-and really want to know.
Use the octane recommended in the operator's manual. I believe 91 is the minimum, but check the manual and/or inside the fuel filler door. Over the long haul engine performance and gas mileage will be optimal. It's kind of like smoking, if lower grade fuel had been used engine function and mileage will improve w/ a switch back to recommended grade gas. It won't void your warranty to use 89 octane but it will degrade your car's performance over time.

Welcome a-board and enjoy your new car!!

Don't believe everything you think
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post #4 of 8 (permalink) Old 11-27-2006, 03:33 PM
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91 octane minimum. There are tons of discussions about this. Try a search. We also had a very recent and long discussion on this in the W163 M-Class forum.

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post #5 of 8 (permalink) Old 11-27-2006, 09:20 PM
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Your engine has knock sensors. When the ECU determines the engine is knocking, it retards the timing. Engines with retarded timing produce less power and have poorer fuel economy numbers than engines running with the factory recommended timing specs. Will the reduced fuel economy offset the $2 per tank in savings? I don't know. What I do know is engines that knock need valve jobs a lot sooner than those that don't. You'd have to save a lot of money in fuel costs to counterbalance the expense of a valve job.

No one can tell you if the car has been run on substandard fuel. Just as no one can tell you how the car was cared for before it was in your possession. Of course, if the car was driven in such a manner as to encourage engine damage, continuing to do so certainly won't reduce future maintenance costs.
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post #6 of 8 (permalink) Old 11-28-2006, 04:48 AM
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I remember reading a few days ago, about someone that did some calculating with using 91 octane and 87 octane.

With the decreased fuel economy that you get with using a lesser grade fuel, that means you'll be filling up more often than you would if you used premium.

So they basically cost the same.

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post #7 of 8 (permalink) Old 11-28-2006, 05:27 AM
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USE PREMIUM.....Like asianML said there was a discussion on this recently on the w163 forum.

The money you "save" using regular is minimal.

Mike
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post #8 of 8 (permalink) Old 12-03-2006, 11:38 AM
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I do the same, use mid-grade most of the time and every 4 tanks or so I put high tess, even try and mix the tanks.
95 C-280, 127000mi.
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