Octane for '99 CLK430 - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 03-27-2008, 09:03 PM Thread Starter
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Octane for '99 CLK430

Just recently purchased my 99 CLK430. It's a beautiful car and has been treated with the utmost care and respect. This is my first Mercedes, so there are a lot of things I do not know about my new car. Definitely a newbie.

The operator's manual calls for 91 octane. After doing a little research, I came to the conclusion that European octane ratings differ from American/Canadian ratings. I live in the USofA and want to know exactly what to put in my new cream puff.

Any insight, suggestions for a new owner, constructive criticisms, or ideas will be appreciated. Thanks for the help.
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post #2 of 11 (permalink) Old 03-28-2008, 01:40 AM
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Congrats and Welcome to the Forum!

use 91 octane as recommended! or up.

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post #3 of 11 (permalink) Old 03-28-2008, 05:37 AM
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The topic of which octane gas to use has been discussed many times at length. If you want to get more info, the search button in the upper right of the screen will help. As suggested use premium.

Mike
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post #4 of 11 (permalink) Old 03-28-2008, 06:46 AM
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There may be different methods to calculate octane rating in the U.S. and Europe, however the manual for a U.S. spec car is written with U.S. spec calculations for pretty much everything. So go with 91 octane.

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post #5 of 11 (permalink) Old 03-28-2008, 11:26 AM Thread Starter
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Sounds great guys. Thanks for the help! On another note, and I'm sure this has been covered hundreds of times on this forum - but the Standard and Winter mode switch by my shifter...it is now late March and I have had it in Winter mode since I purchased it in January...is it safe enough to place in Standard? And should this be done prior to starting the vehicle? Is Winter mode only for ice and snow conditions? Again, any info is appreciated.
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post #6 of 11 (permalink) Old 03-28-2008, 05:55 PM
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Sounds great guys. Thanks for the help! On another note, and I'm sure this has been covered hundreds of times on this forum - but the Standard and Winter mode switch by my shifter...it is now late March and I have had it in Winter mode since I purchased it in January...is it safe enough to place in Standard? And should this be done prior to starting the vehicle? Is Winter mode only for ice and snow conditions? Again, any info is appreciated.
The W/S switch only changes the transmission's shifting characteristics, shifting points, and starting gear. W starts in 2nd and upshifts earlier. S starts in 1st and upshifts later or normally, rather.

You can switch between the two as much as you want and use either whenever you want. Think of W as just assisting you in slippery conditions. The button itself controls nothing mechanical, but rather the ECU/TCU which then controls the tranny.

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post #7 of 11 (permalink) Old 03-28-2008, 06:16 PM
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Your owners manual is for a USA car and the specifications therein are for USA gasoline.

Kent Christensen
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post #8 of 11 (permalink) Old 03-30-2008, 07:09 PM Thread Starter
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Thanks for all the insight guys...I can see I have a lot to learn about the car itself. What is the typical price to replace one of the electronic keys? 2 came with the car, 1 works just fine - and the other I have to take the mechanical key out of the electronic key to lock and unlock the car - but the electronic key still starts the vehicle just fine. I bought a new lithium battery, but it is still functioning properly, and I think the unit itself is toast. Are those overly pricy to replace?
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post #9 of 11 (permalink) Old 03-30-2008, 10:43 PM
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Originally Posted by NOTABMW View Post
Thanks for all the insight guys...I can see I have a lot to learn about the car itself. What is the typical price to replace one of the electronic keys? 2 came with the car, 1 works just fine - and the other I have to take the mechanical key out of the electronic key to lock and unlock the car - but the electronic key still starts the vehicle just fine. I bought a new lithium battery, but it is still functioning properly, and I think the unit itself is toast. Are those overly pricy to replace?
I got a quote of about $200 plus CAD. The valet (non-electronic) key was not much cheaper.

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post #10 of 11 (permalink) Old 03-30-2008, 10:52 PM
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I use V-Power only and sometimes throw in some octance booster... And I use Winter Mode in the rain also to prevent tire spinning... But sometimes, I like to play around...

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