Key Fob Batteries - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 08-02-2007, 07:45 AM Thread Starter
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Red face Key Fob Batteries

Can someone tell me what batteries the key fob takes? Have an 01 E320 4 Matic wagon that I bought last satuday, drove from Philly to MD, did the brakes, took it to a shop for MD inspection and it is supposed to be ready today because I'm driving it to Maine tonight. I had a very hard time locking it at the shop which could have been a big deal because of wheels and new tires in it. Is it true the only way to lock the doors is with the fob? I could manually lock all the doors but the driver's (could not push down the plunger) and have no idea how to lock the hatch. The good news is, I got 29.2 MPG on the PA turnpike!! Quite the improvement over my Diamante (and especially the Suburban).
Thanks!!
glen
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post #2 of 8 (permalink) Old 08-02-2007, 08:00 AM
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Originally Posted by parrothead
Can someone tell me what batteries the key fob takes? Have an 01 E320 4 Matic wagon that I bought last satuday, drove from Philly to MD, did the brakes, took it to a shop for MD inspection and it is supposed to be ready today because I'm driving it to Maine tonight. I had a very hard time locking it at the shop which could have been a big deal because of wheels and new tires in it. Is it true the only way to lock the doors is with the fob? I could manually lock all the doors but the driver's (could not push down the plunger) and have no idea how to lock the hatch. The good news is, I got 29.2 MPG on the PA turnpike!! Quite the improvement over my Diamante (and especially the Suburban).
Thanks!!
glen
You should always be able to lock the doors with the metal key (hidden partly in your plastic key fob).

According to my car manual, the key batteries are of CR 2025 3V type.

Last edited by Diesel Benz; 08-02-2007 at 08:21 AM.
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post #3 of 8 (permalink) Old 08-02-2007, 12:11 PM Thread Starter
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Duh--who would have thought--a key to lock the doors?? Simply amazing. Guess I got caught up in the whole "no key to drive the car" concept which is new to me. Thanks for the battery info as well; I have a manual, but apparently I am missing the one that has specs like what weight oil to use. Dealer told me MB now recommends Mobile1 15W-50.

Thanks again!!
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post #4 of 8 (permalink) Old 08-02-2007, 12:20 PM
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I think the batteries are also used in wrist watches, and I bought a pair of extras at the local WalMart for about $6.00 (2025 as Diesel Benz wrote). The way to open the smart key to access the batteries is in the owner's manual, and it also tells you the battery type.

My dealer is now using Mobil One 5W40, but I'm not positive it is the "ESP M" variety.

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Last edited by Musikmann; 08-02-2007 at 05:00 PM.
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post #5 of 8 (permalink) Old 08-02-2007, 01:44 PM
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The dealer put in 0/40Mobil Synth European the last time (9) plus filter$99. To get to the batteries remove metal key by using slide at top of remote, then release graylatch in that cavity which should allow the remote board to slide out of the housing.
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post #6 of 8 (permalink) Old 08-02-2007, 11:34 PM
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Quote:
Originally Posted by parrothead
Duh--who would have thought--a key to lock the doors?? Simply amazing. Guess I got caught up in the whole "no key to drive the car" concept which is new to me. Thanks for the battery info as well; I have a manual, but apparently I am missing the one that has specs like what weight oil to use. Dealer told me MB now recommends Mobile1 15W-50.

Thanks again!!
glen
Hey, Glen. The manual shows how to remove the batteries in the key, pretty decent directions.

Re: oil, personally I'd request that the dealer show me where on the container it says it meets (at least) MB's 229.3 spec. Failing that, ask them for the tech bulletin from Mercedes reflecting MB's official position that the 15W50 is approved for the MY 98 and newer engines. If they can't do so I'd demand an oil change to 0W40 for free. The only bottle of 15W50 I've ever seen did not bear the approval of MB for the minimum 229.3 spec and Mobil 1's website only reflects the Euro 0W40 Mobil 1. Not that I don't trust stealerships (and I usually don't) but I wouldn't be surprised that they're using it because they can save $9 an oil change or something equally stupid.

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post #7 of 8 (permalink) Old 08-03-2007, 06:05 PM
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oil viscosity

mechanics in the "know" generally recommend nothing less than 15-40. lower viscosity oils are to cover extreme weather conditions. And synthetic oils flow much better than the regular stuff. Engine longevity will be well served with the thicker viscosity.
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post #8 of 8 (permalink) Old 08-04-2007, 01:02 AM
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mechanics in the "know" generally recommend nothing less than 15-40. lower viscosity oils are to cover extreme weather conditions. And synthetic oils flow much better than the regular stuff. Engine longevity will be well served with the thicker viscosity.
I'd follow the MB mechanics, they also know a bit about their cars.
Mercedes-Benz Engine Oil Recommendations

I see some 15W-40 oils approved but it must be only for California type of weather. A 5W-40 synthetic oil would be thicker or equal when the engine runs hot, it would flow smoothly enough when the engine is cold (winter cold). I believe the idea of thick oil belongs for very old cars (at most, not familiar with those any more).
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