How often to fill up my diesel car? - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 09-05-2016, 07:59 AM Thread Starter
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How often to fill up my diesel car?

I know its a good thing to have a fresh diesel, I get 550-600 miles per tank or 2-3 weeks of driving.
What is better to get fresh fuel every week or every half tank, or simply when tank is empty?
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post #2 of 9 (permalink) Old 09-05-2016, 11:35 AM
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keep it topped up every week or so to stop moisture build up in the tank
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post #3 of 9 (permalink) Old 09-05-2016, 11:50 AM
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There is really no good reason to worry about the ageing of diesel. Diesel ages so slowly that years old diesel will burn fine. It will lose some volatiles but will still burn fine. Gasoline goes bad with time, but it will not have a problem in the time frame you mentioned. I would just empty the tank normally.
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post #4 of 9 (permalink) Old 09-05-2016, 06:59 PM
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Yup.

I remember seeing a video on youtube (not sure if its still around) where a bunch of dudes bought a tractor that was sitting in a barn for years. They changed the battery and attached an external water pump to clear any coolant sludge, and then cranked it.

She started up on first try....on old diesel. Still ran perfectly like she never sat for years.

Bloody ford tractors.

--1998 MB E300TD 285k
--2004 Dodge Ram 5.7L 212k and holding (damn gas guzzler)
--2011 Suzuki DL650 44k
--1997 MB E320 161k. SOLD...loved that stupid car.
--1998 MB ML320 207k. SOLD, thank heavens!
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post #5 of 9 (permalink) Old 09-05-2016, 08:59 PM Thread Starter
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Thank you all for your comments, I guess there is no best practice for this.
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post #6 of 9 (permalink) Old 09-05-2016, 11:45 PM
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I think farmers have the best experience with seasonal running of diesel equipment and dealing with old fuel.
The common storage preparation is
"disconnect battery cable, coffee can over exhaust and walk away"
I bought motorhome that was sitting under a tree for 7 years with full tank.
Used the 120 gallons to the last drop.
Even gasoline in my boat open tank was good for 2 years, although it did smoke a bit on 3rd.
Cold, moist climates will bring some problems.


Last edited by Kajtek1; 09-05-2016 at 11:47 PM.
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post #7 of 9 (permalink) Old 09-09-2016, 09:40 PM Thread Starter
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Quote:
Originally Posted by Kajtek1 View Post
I think farmers have the best experience with seasonal running of diesel equipment and dealing with old fuel.
The common storage preparation is
"disconnect battery cable, coffee can over exhaust and walk away"
I bought motorhome that was sitting under a tree for 7 years with full tank.
Used the 120 gallons to the last drop.
Even gasoline in my boat open tank was good for 2 years, although it did smoke a bit on 3rd.
Cold, moist climates will bring some problems.


Leaving in Seattle area, we do have some cold and rain.
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post #8 of 9 (permalink) Old 09-10-2016, 11:14 AM
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Quote:
Originally Posted by dand. View Post
Leaving in Seattle area, we do have some cold and rain.
My brother lives 1/2 the way between Seattle and Leavenworth, so he is getting some mountain weather and snow.
I think the diesel in his tractor is at least 3 years old.
Than tractors do allow water drainage from the separators, while MB abounded the idea years ago.

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post #9 of 9 (permalink) Old 09-10-2016, 09:03 PM
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With Diesels I like to add a little Bio Bor to discourage the bugs from colonizing the fuel tank. Get it at a boat store. HEET will deal with the water in the fuel just fine, so no need to get paranoid about filling or keeping it full. You seem to be driving it enough that it just does not matter.

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